78551138670 has 16 divisors (see below), whose sum is σ = 188522732880. Its totient is φ = 20946970304.

The previous prime is 78551138647. The next prime is 78551138693. The reversal of 78551138670 is 7683115587.

It is an interprime number because it is at equal distance from previous prime (78551138647) and next prime (78551138693).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1309185615 + ... + 1309185674.

It is an arithmetic number, because the mean of its divisors is an integer number (11782670805).

Almost surely, 2^78551138670 is an apocalyptic number.

78551138670 is an abundant number, since it is smaller than the sum of its proper divisors (109971594210).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78551138670 is a wasteful number, since it uses less digits than its factorization.

78551138670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2618371299.

The product of its (nonzero) digits is 1411200, while the sum is 51.

The spelling of 78551138670 in words is "seventy-eight billion, five hundred fifty-one million, one hundred thirty-eight thousand, six hundred seventy".