161654972 has 24 divisors (see below), whose sum is σ = 302914080. Its totient is φ = 75215360.

The previous prime is 161654963. The next prime is 161655007. The reversal of 161654972 is 279456161.

It is a super-2 number, since 2×161654972² = 52264659944641568, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7304 + ... + 19407.

It is an arithmetic number, because the mean of its divisors is an integer number (12621420).

Almost surely, 2^161654972 is an apocalyptic number.

It is an amenable number.

161654972 is a deficient number, since it is larger than the sum of its proper divisors (141259108).

161654972 is a wasteful number, since it uses less digits than its factorization.

161654972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26821 (or 26819 counting only the distinct ones).

The product of its digits is 90720, while the sum is 41.

The square root of 161654972 is about 12714.3608569208. The cubic root of 161654972 is about 544.7488919794.

The spelling of 161654972 in words is "one hundred sixty-one million, six hundred fifty-four thousand, nine hundred seventy-two".