78061917859 has 8 divisors (see below), whose sum is σ = 80966790000. Its totient is φ = 75171251232.

The previous prime is 78061917841. The next prime is 78061917911. The reversal of 78061917859 is 95871916087.

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 78061917859 - 2²⁹ = 77525046947 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78061917797 and 78061917806.

It is not an unprimeable number, because it can be changed into a prime (78061917839) 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, 3540184 + ... + 3562165.

It is an arithmetic number, because the mean of its divisors is an integer number (10120848750).

Almost surely, 2^78061917859 is an apocalyptic number.

78061917859 is a deficient number, since it is larger than the sum of its proper divisors (2904872141).

78061917859 is a wasteful number, since it uses less digits than its factorization.

78061917859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7102757.

The product of its (nonzero) digits is 7620480, while the sum is 61.

The spelling of 78061917859 in words is "seventy-eight billion, sixty-one million, nine hundred seventeen thousand, eight hundred fifty-nine".