77638884961 has 16 divisors (see below), whose sum is σ = 89815366080. Its totient is φ = 66328084480.

The previous prime is 77638884923. The next prime is 77638884977. The reversal of 77638884961 is 16948883677.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 77638884961 - 2¹¹ = 77638882913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77638884901) 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 15 ways as a sum of consecutive naturals, for example, 191776 + ... + 438241.

It is an arithmetic number, because the mean of its divisors is an integer number (5613460380).

Almost surely, 2^77638884961 is an apocalyptic number.

It is an amenable number.

77638884961 is a deficient number, since it is larger than the sum of its proper divisors (12176481119).

77638884961 is a wasteful number, since it uses less digits than its factorization.

77638884961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630704.

The product of its digits is 97542144, while the sum is 67.

The spelling of 77638884961 in words is "seventy-seven billion, six hundred thirty-eight million, eight hundred eighty-four thousand, nine hundred sixty-one".