81177301308 has 24 divisors (see below), whose sum is σ = 189418421248. Its totient is φ = 27058426416.

The previous prime is 81177301297. The next prime is 81177301333. The reversal of 81177301308 is 80310377118.

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, 740535 + ... + 843057.

Almost surely, 2^81177301308 is an apocalyptic number.

It is an amenable number.

81177301308 is an abundant number, since it is smaller than the sum of its proper divisors (108241119940).

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

81177301308 is a wasteful number, since it uses less digits than its factorization.

81177301308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168513 (or 168511 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 39.

The spelling of 81177301308 in words is "eighty-one billion, one hundred seventy-seven million, three hundred one thousand, three hundred eight".