78039815951 has 8 divisors (see below), whose sum is σ = 78540567600. Its totient is φ = 77539332672.

The previous prime is 78039815947. The next prime is 78039815957. The reversal of 78039815951 is 15951893087.

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 78039815951 - 2² = 78039815947 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 (78039815957) 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 7 ways as a sum of consecutive naturals, for example, 533525 + ... + 663873.

It is an arithmetic number, because the mean of its divisors is an integer number (9817570950).

Almost surely, 2^78039815951 is an apocalyptic number.

78039815951 is a deficient number, since it is larger than the sum of its proper divisors (500751649).

78039815951 is a wasteful number, since it uses less digits than its factorization.

78039815951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134185.

The product of its (nonzero) digits is 2721600, while the sum is 56.

The spelling of 78039815951 in words is "seventy-eight billion, thirty-nine million, eight hundred fifteen thousand, nine hundred fifty-one".