77903910021 has 32 divisors (see below), whose sum is σ = 120036446208. Its totient is φ = 44020154880.

The previous prime is 77903910013. The next prime is 77903910043. The reversal of 77903910021 is 12001930977.

It is not a de Polignac number, because 77903910021 - 2³ = 77903910013 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77903914021) 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 31 ways as a sum of consecutive naturals, for example, 2475616 + ... + 2506886.

It is an arithmetic number, because the mean of its divisors is an integer number (3751138944).

Almost surely, 2^77903910021 is an apocalyptic number.

It is an amenable number.

77903910021 is a deficient number, since it is larger than the sum of its proper divisors (42132536187).

77903910021 is a wasteful number, since it uses less digits than its factorization.

77903910021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32601.

The product of its (nonzero) digits is 23814, while the sum is 39.

The spelling of 77903910021 in words is "seventy-seven billion, nine hundred three million, nine hundred ten thousand, twenty-one".