78796660309 has 4 divisors (see below), whose sum is σ = 78797329216. Its totient is φ = 78795991404.

The previous prime is 78796660303. The next prime is 78796660337. The reversal of 78796660309 is 90306669787.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 78796660309 - 2⁵ = 78796660277 is a prime.

It is a super-4 number, since 4×78796660309⁴ (a number of 45 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78796660303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105519 + ... + 410764.

It is an arithmetic number, because the mean of its divisors is an integer number (19699332304).

Almost surely, 2^78796660309 is an apocalyptic number.

It is an amenable number.

78796660309 is a deficient number, since it is larger than the sum of its proper divisors (668907).

78796660309 is a wasteful number, since it uses less digits than its factorization.

78796660309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668906.

The product of its (nonzero) digits is 20575296, while the sum is 61.

The spelling of 78796660309 in words is "seventy-eight billion, seven hundred ninety-six million, six hundred sixty thousand, three hundred nine".