80747473921 has 3 divisors (see below), whose sum is σ = 80747758083. Its totient is φ = 80747189760.

The previous prime is 80747473909. The next prime is 80747473973. The reversal of 80747473921 is 12937474708.

It is a happy number.

The square root of 80747473921 is 284161.

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., 12124432321 + 68623041600 = 110111^2 + 261960^2 .

It is a de Polignac number, because none of the positive numbers 2^k-80747473921 is a prime.

It is a super-2 number, since 2×80747473921² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80747473901) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 142081 + ... + 426241.

It is an arithmetic number, because the mean of its divisors is an integer number (26915919361).

Almost surely, 2^80747473921 is an apocalyptic number.

80747473921 is the 284161-st square number.

80747473921 is the 142081-st centered octagonal number.

It is an amenable number.

80747473921 is a deficient number, since it is larger than the sum of its proper divisors (284162).

80747473921 is an frugal number, since it uses more digits than its factorization.

80747473921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568322 (or 284161 counting only the distinct ones).

The product of its (nonzero) digits is 2370816, while the sum is 52.

The spelling of 80747473921 in words is "eighty billion, seven hundred forty-seven million, four hundred seventy-three thousand, nine hundred twenty-one".