161877481720 has 16 divisors (see below), whose sum is σ = 364224333960. Its totient is φ = 64750992672.

The previous prime is 161877481709. The next prime is 161877481723. The reversal of 161877481720 is 27184778161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161877481723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2023468482 + ... + 2023468561.

Almost surely, 2^161877481720 is an apocalyptic number.

161877481720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161877481720 is an abundant number, since it is smaller than the sum of its proper divisors (202346852240).

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

161877481720 is a wasteful number, since it uses less digits than its factorization.

161877481720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4046937054 (or 4046937050 counting only the distinct ones).

The product of its (nonzero) digits is 1053696, while the sum is 52.

The spelling of 161877481720 in words is "one hundred sixty-one billion, eight hundred seventy-seven million, four hundred eighty-one thousand, seven hundred twenty".