161925778410 has 64 divisors (see below), whose sum is σ = 446264363520. Its totient is φ = 37188694080.

The previous prime is 161925778403. The next prime is 161925778423. The reversal of 161925778410 is 14877529161.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12906472 + ... + 12919011.

It is an arithmetic number, because the mean of its divisors is an integer number (6972880680).

Almost surely, 2^161925778410 is an apocalyptic number.

161925778410 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161925778410 is an abundant number, since it is smaller than the sum of its proper divisors (284338585110).

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

161925778410 is a wasteful number, since it uses less digits than its factorization.

161925778410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25825523.

The product of its (nonzero) digits is 846720, while the sum is 51.

The spelling of 161925778410 in words is "one hundred sixty-one billion, nine hundred twenty-five million, seven hundred seventy-eight thousand, four hundred ten".