136778664880 has 80 divisors (see below), whose sum is σ = 373606650144. Its totient is φ = 45911715840.

The previous prime is 136778664857. The next prime is 136778664887. The reversal of 136778664880 is 88466877631.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (136778664887) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5966649 + ... + 5989528.

Almost surely, 2^136778664880 is an apocalyptic number.

136778664880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

136778664880 is an abundant number, since it is smaller than the sum of its proper divisors (236827985264).

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

136778664880 is a wasteful number, since it uses less digits than its factorization.

136778664880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11956214 (or 11956208 counting only the distinct ones).

The product of its (nonzero) digits is 65028096, while the sum is 64.

The spelling of 136778664880 in words is "one hundred thirty-six billion, seven hundred seventy-eight million, six hundred sixty-four thousand, eight hundred eighty".