76707395521 has 3 divisors (see below), whose sum is σ = 76707672483. Its totient is φ = 76707118560.

The previous prime is 76707395483. The next prime is 76707395539. The reversal of 76707395521 is 12559370767.

The square root of 76707395521 is 276961.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12559370767 = 2221 ⋅5654827.

It can be written as a sum of positive squares in only one way, i.e., 69611017921 + 7096377600 = 263839^2 + 84240^2 .

It is not a de Polignac number, because 76707395521 - 2²⁵ = 76673841089 is a prime.

It is a super-2 number, since 2×76707395521² (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 (76707395551) 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, 138481 + ... + 415441.

It is an arithmetic number, because the mean of its divisors is an integer number (25569224161).

Almost surely, 2^76707395521 is an apocalyptic number.

76707395521 is the 276961-st square number.

76707395521 is the 138481-st centered octagonal number.

It is an amenable number.

76707395521 is a deficient number, since it is larger than the sum of its proper divisors (276962).

76707395521 is an frugal number, since it uses more digits than its factorization.

76707395521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553922 (or 276961 counting only the distinct ones).

The product of its (nonzero) digits is 2778300, while the sum is 52.

The spelling of 76707395521 in words is "seventy-six billion, seven hundred seven million, three hundred ninety-five thousand, five hundred twenty-one".