77630152521 has 4 divisors (see below), whose sum is σ = 103506870032. Its totient is φ = 51753435012.

The previous prime is 77630152517. The next prime is 77630152541. The reversal of 77630152521 is 12525103677.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 77630152521 - 2² = 77630152517 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77630152521.

It is not an unprimeable number, because it can be changed into a prime (77630152541) 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 3 ways as a sum of consecutive naturals, for example, 12938358751 + ... + 12938358756.

It is an arithmetic number, because the mean of its divisors is an integer number (25876717508).

Almost surely, 2^77630152521 is an apocalyptic number.

It is an amenable number.

77630152521 is a deficient number, since it is larger than the sum of its proper divisors (25876717511).

77630152521 is a wasteful number, since it uses less digits than its factorization.

77630152521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25876717510.

The product of its (nonzero) digits is 88200, while the sum is 39.

The spelling of 77630152521 in words is "seventy-seven billion, six hundred thirty million, one hundred fifty-two thousand, five hundred twenty-one".