78075687681 has 24 divisors (see below), whose sum is σ = 115462226880. Its totient is φ = 50811991776.

The previous prime is 78075687659. The next prime is 78075687713. The reversal of 78075687681 is 18678657087.

78075687681 is a `hidden beast` number, since 7 + 8 + 0 + 7 + 568 + 7 + 68 + 1 = 666.

It is not a de Polignac number, because 78075687681 - 2¹³ = 78075679489 is a prime.

It is a super-2 number, since 2×78075687681² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78075687631) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 660175 + ... + 769403.

It is an arithmetic number, because the mean of its divisors is an integer number (4810926120).

Almost surely, 2^78075687681 is an apocalyptic number.

It is an amenable number.

78075687681 is a deficient number, since it is larger than the sum of its proper divisors (37386539199).

78075687681 is a wasteful number, since it uses less digits than its factorization.

78075687681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111125 (or 111122 counting only the distinct ones).

The product of its (nonzero) digits is 31610880, while the sum is 63.

The spelling of 78075687681 in words is "seventy-eight billion, seventy-five million, six hundred eighty-seven thousand, six hundred eighty-one".