77037608721 has 16 divisors (see below), whose sum is σ = 105504537600. Its totient is φ = 49964848128.

The previous prime is 77037608699. The next prime is 77037608741. The reversal of 77037608721 is 12780673077.

It is a happy number.

It is not a de Polignac number, because 77037608721 - 2²¹ = 77035511569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77037608741) 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, 1139185 + ... + 1204913.

It is an arithmetic number, because the mean of its divisors is an integer number (6594033600).

Almost surely, 2^77037608721 is an apocalyptic number.

It is an amenable number.

77037608721 is a deficient number, since it is larger than the sum of its proper divisors (28466928879).

77037608721 is a wasteful number, since it uses less digits than its factorization.

77037608721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76328.

The product of its (nonzero) digits is 691488, while the sum is 48.

The spelling of 77037608721 in words is "seventy-seven billion, thirty-seven million, six hundred eight thousand, seven hundred twenty-one".