78009959681 has 8 divisors (see below), whose sum is σ = 78376698624. Its totient is φ = 77643372240.

The previous prime is 78009959633. The next prime is 78009959723. The reversal of 78009959681 is 18695990087.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78009959681 - 2²² = 78005765377 is a prime.

It is a super-2 number, since 2×78009959681² (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 (78008959681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1070126 + ... + 1140696.

It is an arithmetic number, because the mean of its divisors is an integer number (9797087328).

Almost surely, 2^78009959681 is an apocalyptic number.

It is an amenable number.

78009959681 is a deficient number, since it is larger than the sum of its proper divisors (366738943).

78009959681 is a wasteful number, since it uses less digits than its factorization.

78009959681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75751.

The product of its (nonzero) digits is 9797760, while the sum is 62.

The spelling of 78009959681 in words is "seventy-eight billion, nine million, nine hundred fifty-nine thousand, six hundred eighty-one".