77859989451 has 16 divisors (see below), whose sum is σ = 116177980800. Its totient is φ = 51533227944.

The previous prime is 77859989437. The next prime is 77859989489. The reversal of 77859989451 is 15498995877.

It is a happy number.

77859989451 is a `hidden beast` number, since 7 + 7 + 8 + 5 + 99 + 89 + 451 = 666.

It is not a de Polignac number, because 77859989451 - 2⁷ = 77859989323 is a prime.

It is a super-3 number, since 3×77859989451³ (a number of 34 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 77859989451.

It is not an unprimeable number, because it can be changed into a prime (77859989491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10369281 + ... + 10376786.

It is an arithmetic number, because the mean of its divisors is an integer number (7261123800).

Almost surely, 2^77859989451 is an apocalyptic number.

77859989451 is a deficient number, since it is larger than the sum of its proper divisors (38317991349).

77859989451 is a wasteful number, since it uses less digits than its factorization.

77859989451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20746215 (or 20746209 counting only the distinct ones).

The product of its digits is 228614400, while the sum is 72.

The spelling of 77859989451 in words is "seventy-seven billion, eight hundred fifty-nine million, nine hundred eighty-nine thousand, four hundred fifty-one".