77670500521 has 4 divisors (see below), whose sum is σ = 77674856832. Its totient is φ = 77666144212.

The previous prime is 77670500503. The next prime is 77670500533. The reversal of 77670500521 is 12500507677.

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 a cyclic number.

It is not a de Polignac number, because 77670500521 - 2²⁵ = 77636946089 is a prime.

It is a super-2 number, since 2×77670500521² (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 (77670500581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2151301 + ... + 2187106.

It is an arithmetic number, because the mean of its divisors is an integer number (19418714208).

Almost surely, 2^77670500521 is an apocalyptic number.

It is an amenable number.

77670500521 is a deficient number, since it is larger than the sum of its proper divisors (4356311).

77670500521 is a wasteful number, since it uses less digits than its factorization.

77670500521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4356310.

The product of its (nonzero) digits is 102900, while the sum is 40.

The spelling of 77670500521 in words is "seventy-seven billion, six hundred seventy million, five hundred thousand, five hundred twenty-one".