168780055780 has 24 divisors (see below), whose sum is σ = 405072134208. Its totient is φ = 57867447648.

The previous prime is 168780055777. The next prime is 168780055781. The reversal of 168780055780 is 87550087861.

It is a super-2 number, since 2×168780055780² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (168780055781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 602785774 + ... + 602786053.

It is an arithmetic number, because the mean of its divisors is an integer number (16878005592).

Almost surely, 2^168780055780 is an apocalyptic number.

168780055780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

168780055780 is an abundant number, since it is smaller than the sum of its proper divisors (236292078428).

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

168780055780 is a wasteful number, since it uses less digits than its factorization.

168780055780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1205571843 (or 1205571841 counting only the distinct ones).

The product of its (nonzero) digits is 3763200, while the sum is 55.

The spelling of 168780055780 in words is "one hundred sixty-eight billion, seven hundred eighty million, fifty-five thousand, seven hundred eighty".