29910538681 has 2 divisors, whose sum is σ = 29910538682. Its totient is φ = 29910538680.

The previous prime is 29910538649. The next prime is 29910538699. The reversal of 29910538681 is 18683501992.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29486384656 + 424154025 = 171716^2 + 20595^2 .

It is a cyclic number.

It is not a de Polignac number, because 29910538681 - 2⁵ = 29910538649 is a prime.

It is a super-2 number, since 2×29910538681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (29910538621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14955269340 + 14955269341.

It is an arithmetic number, because the mean of its divisors is an integer number (14955269341).

Almost surely, 2^29910538681 is an apocalyptic number.

It is an amenable number.

29910538681 is a deficient number, since it is larger than the sum of its proper divisors (1).

29910538681 is an equidigital number, since it uses as much as digits as its factorization.

29910538681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 933120, while the sum is 52.

The spelling of 29910538681 in words is "twenty-nine billion, nine hundred ten million, five hundred thirty-eight thousand, six hundred eighty-one".