156167661 has 24 divisors (see below), whose sum is σ = 238749120. Its totient is φ = 90445056.

The previous prime is 156167657. The next prime is 156167663. The reversal of 156167661 is 166761651.

It is not a de Polignac number, because 156167661 - 2² = 156167657 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156167663) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 441 + ... + 17678.

It is an arithmetic number, because the mean of its divisors is an integer number (9947880).

Almost surely, 2^156167661 is an apocalyptic number.

It is an amenable number.

156167661 is a deficient number, since it is larger than the sum of its proper divisors (82581459).

156167661 is a wasteful number, since it uses less digits than its factorization.

156167661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18165 (or 18152 counting only the distinct ones).

The product of its digits is 45360, while the sum is 39.

The square root of 156167661 is about 12496.7060059841. The cubic root of 156167661 is about 538.5140457520.

The spelling of 156167661 in words is "one hundred fifty-six million, one hundred sixty-seven thousand, six hundred sixty-one".