78009959671 has 16 divisors (see below), whose sum is σ = 93502785024. Its totient is φ = 63633788064.

The previous prime is 78009959633. The next prime is 78009959723. The reversal of 78009959671 is 17695990087.

It is not a de Polignac number, because 78009959671 - 2⁷ = 78009959543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78009959971) 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, 1198065 + ... + 1261498.

It is an arithmetic number, because the mean of its divisors is an integer number (5843924064).

Almost surely, 2^78009959671 is an apocalyptic number.

78009959671 is a deficient number, since it is larger than the sum of its proper divisors (15492825353).

78009959671 is a wasteful number, since it uses less digits than its factorization.

78009959671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2459790.

The product of its (nonzero) digits is 8573040, while the sum is 61.

The spelling of 78009959671 in words is "seventy-eight billion, nine million, nine hundred fifty-nine thousand, six hundred seventy-one".