78155639059608 has 128 divisors (see below), whose sum is σ = 236857775616000. Its totient is φ = 23681276415360.

The previous prime is 78155639059607. The next prime is 78155639059609. The reversal of 78155639059608 is 80695093655187.

It is a happy number.

78155639059608 is a `hidden beast` number, since 7 + 8 + 1 + 5 + 5 + 6 + 3 + 9 + 0 + 5 + 9 + 608 = 666.

It is an interprime number because it is at equal distance from previous prime (78155639059607) and next prime (78155639059609).

It is a super-2 number, since 2×78155639059608² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78155639059601) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23530566 + ... + 26645802.

It is an arithmetic number, because the mean of its divisors is an integer number (1850451372000).

Almost surely, 2^{78155639059608} is an apocalyptic number.

It is an amenable number.

78155639059608 is an abundant number, since it is smaller than the sum of its proper divisors (158702136556392).

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

78155639059608 is a wasteful number, since it uses less digits than its factorization.

78155639059608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3125822 (or 3125812 counting only the distinct ones).

The product of its (nonzero) digits is 489888000, while the sum is 72.

The spelling of 78155639059608 in words is "seventy-eight trillion, one hundred fifty-five billion, six hundred thirty-nine million, fifty-nine thousand, six hundred eight".