76772534521 has 2 divisors, whose sum is σ = 76772534522. Its totient is φ = 76772534520.

The previous prime is 76772534477. The next prime is 76772534549. The reversal of 76772534521 is 12543527767.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62630568121 + 14141966400 = 250261^2 + 118920^2 .

It is an emirp because it is prime and its reverse (12543527767) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 76772534521 - 2²⁷ = 76638316793 is a prime.

It is not a weakly prime, because it can be changed into another prime (76772534551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38386267260 + 38386267261.

It is an arithmetic number, because the mean of its divisors is an integer number (38386267261).

Almost surely, 2^76772534521 is an apocalyptic number.

It is an amenable number.

76772534521 is a deficient number, since it is larger than the sum of its proper divisors (1).

76772534521 is an equidigital number, since it uses as much as digits as its factorization.

76772534521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2469600, while the sum is 49.

The spelling of 76772534521 in words is "seventy-six billion, seven hundred seventy-two million, five hundred thirty-four thousand, five hundred twenty-one".