78831903669 has 4 divisors (see below), whose sum is σ = 105109204896. Its totient is φ = 52554602444.

The previous prime is 78831903613. The next prime is 78831903701. The reversal of 78831903669 is 96630913887.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78831903669 is a prime.

It is a super-2 number, since 2×78831903669² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78831903869) 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, 13138650609 + ... + 13138650614.

It is an arithmetic number, because the mean of its divisors is an integer number (26277301224).

Almost surely, 2^78831903669 is an apocalyptic number.

It is an amenable number.

78831903669 is a deficient number, since it is larger than the sum of its proper divisors (26277301227).

78831903669 is a wasteful number, since it uses less digits than its factorization.

78831903669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26277301226.

The product of its (nonzero) digits is 11757312, while the sum is 60.

The spelling of 78831903669 in words is "seventy-eight billion, eight hundred thirty-one million, nine hundred three thousand, six hundred sixty-nine".