29770396681 has 3 divisors (see below), whose sum is σ = 29770569223. Its totient is φ = 29770224140.

The previous prime is 29770396661. The next prime is 29770396723. The reversal of 29770396681 is 18669307792.

The square root of 29770396681 is 172541.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 13165497081 + 16604899600 = 114741^2 + 128860^2 .

It is not a de Polignac number, because 29770396681 - 2¹⁹ = 29769872393 is a prime.

It is a super-2 number, since 2×29770396681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (29770396661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 86271 + ... + 258811.

Almost surely, 2^29770396681 is an apocalyptic number.

29770396681 is the 172541-st square number.

29770396681 is the 86271-st centered octagonal number.

It is an amenable number.

29770396681 is a deficient number, since it is larger than the sum of its proper divisors (172542).

29770396681 is an frugal number, since it uses more digits than its factorization.

29770396681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345082 (or 172541 counting only the distinct ones).

The product of its (nonzero) digits is 6858432, while the sum is 58.

It can be divided in two parts, 297703 and 96681, that added together give a square (394384 = 628²).

The spelling of 29770396681 in words is "twenty-nine billion, seven hundred seventy million, three hundred ninety-six thousand, six hundred eighty-one".