161257795380 has 120 divisors (see below), whose sum is σ = 551860071840. Its totient is φ = 39092794560.

The previous prime is 161257795343. The next prime is 161257795399. The reversal of 161257795380 is 83597752161.

161257795380 is a `hidden beast` number, since 1 + 6 + 1 + 257 + 7 + 9 + 5 + 380 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4506810 + ... + 4542449.

It is an arithmetic number, because the mean of its divisors is an integer number (4598833932).

Almost surely, 2^161257795380 is an apocalyptic number.

161257795380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161257795380 is an abundant number, since it is smaller than the sum of its proper divisors (390602276460).

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

161257795380 is a wasteful number, since it uses less digits than its factorization.

161257795380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9049291 (or 9049280 counting only the distinct ones).

The product of its (nonzero) digits is 3175200, while the sum is 54.

The spelling of 161257795380 in words is "one hundred sixty-one billion, two hundred fifty-seven million, seven hundred ninety-five thousand, three hundred eighty".