16157661 has 16 divisors (see below), whose sum is σ = 24210816. Its totient is φ = 9510336.

The previous prime is 16157639. The next prime is 16157699. The reversal of 16157661 is 16675161.

It is not a de Polignac number, because 16157661 - 2⁵ = 16157629 is a prime.

It is a super-2 number, since 2×16157661² = 522140017981842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16157161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8110 + ... + 9903.

It is an arithmetic number, because the mean of its divisors is an integer number (1513176).

Almost surely, 2^16157661 is an apocalyptic number.

It is an amenable number.

16157661 is a deficient number, since it is larger than the sum of its proper divisors (8053155).

16157661 is a wasteful number, since it uses less digits than its factorization.

16157661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18052.

The product of its digits is 7560, while the sum is 33.

The square root of 16157661 is about 4019.6593139220. The cubic root of 16157661 is about 252.8091745873.

The spelling of 16157661 in words is "sixteen million, one hundred fifty-seven thousand, six hundred sixty-one".