78155455188 has 48 divisors (see below), whose sum is σ = 187289968320. Its totient is φ = 25356672000.

The previous prime is 78155455127. The next prime is 78155455207. The reversal of 78155455188 is 88155455187.

It is a super-2 number, since 2×78155455188² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 474973 + ... + 617988.

It is an arithmetic number, because the mean of its divisors is an integer number (3901874340).

Almost surely, 2^78155455188 is an apocalyptic number.

It is an amenable number.

78155455188 is an abundant number, since it is smaller than the sum of its proper divisors (109134513132).

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

78155455188 is a wasteful number, since it uses less digits than its factorization.

78155455188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1093128 (or 1093126 counting only the distinct ones).

The product of its digits is 8960000, while the sum is 57.

Subtracting 78155455188 from its reverse (88155455187), we obtain a palindrome (9999999999).

The spelling of 78155455188 in words is "seventy-eight billion, one hundred fifty-five million, four hundred fifty-five thousand, one hundred eighty-eight".