77506238681 has 16 divisors (see below), whose sum is σ = 80531299200. Its totient is φ = 74540269440.

The previous prime is 77506238647. The next prime is 77506238683. The reversal of 77506238681 is 18683260577.

It is a cyclic number.

It is not a de Polignac number, because 77506238681 - 2⁶ = 77506238617 is a prime.

It is a super-2 number, since 2×77506238681² (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 (77506238683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1859651 + ... + 1900871.

It is an arithmetic number, because the mean of its divisors is an integer number (5033206200).

Almost surely, 2^77506238681 is an apocalyptic number.

It is an amenable number.

77506238681 is a deficient number, since it is larger than the sum of its proper divisors (3025060519).

77506238681 is a wasteful number, since it uses less digits than its factorization.

77506238681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41936.

The product of its (nonzero) digits is 3386880, while the sum is 53.

The spelling of 77506238681 in words is "seventy-seven billion, five hundred six million, two hundred thirty-eight thousand, six hundred eighty-one".