161581061474 has 64 divisors (see below), whose sum is σ = 296433561600. Its totient is φ = 64479141888.

The previous prime is 161581061471. The next prime is 161581061503. The reversal of 161581061474 is 474160185161.

It is a super-2 number, since 2×161581061474² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161581061471) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15297407 + ... + 15307965.

It is an arithmetic number, because the mean of its divisors is an integer number (4631774400).

Almost surely, 2^161581061474 is an apocalyptic number.

161581061474 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

161581061474 is a deficient number, since it is larger than the sum of its proper divisors (134852500126).

161581061474 is a wasteful number, since it uses less digits than its factorization.

161581061474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11267.

The product of its (nonzero) digits is 161280, while the sum is 44.

The spelling of 161581061474 in words is "one hundred sixty-one billion, five hundred eighty-one million, sixty-one thousand, four hundred seventy-four".