161661052 has 24 divisors (see below), whose sum is σ = 323747424. Its totient is φ = 69192192.

The previous prime is 161660999. The next prime is 161661083. The reversal of 161661052 is 250166161.

It is a super-2 number, since 2×161661052² = 52268591467493408, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 161661052.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20628 + ... + 27364.

It is an arithmetic number, because the mean of its divisors is an integer number (13489476).

Almost surely, 2^161661052 is an apocalyptic number.

It is an amenable number.

161661052 is an abundant number, since it is smaller than the sum of its proper divisors (162086372).

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

161661052 is a wasteful number, since it uses less digits than its factorization.

161661052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7605 (or 7603 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 161661052 is about 12714.5999543831. The cubic root of 161661052 is about 544.7557214048.

The spelling of 161661052 in words is "one hundred sixty-one million, six hundred sixty-one thousand, fifty-two".