261137164 has 6 divisors (see below), whose sum is σ = 456990044. Its totient is φ = 130568580.

The previous prime is 261137131. The next prime is 261137167. The reversal of 261137164 is 461731162.

It is not an unprimeable number, because it can be changed into a prime (261137167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32642142 + ... + 32642149.

Almost surely, 2^261137164 is an apocalyptic number.

It is an amenable number.

261137164 is a deficient number, since it is larger than the sum of its proper divisors (195852880).

261137164 is a wasteful number, since it uses less digits than its factorization.

261137164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65284295 (or 65284293 counting only the distinct ones).

The product of its digits is 6048, while the sum is 31.

The square root of 261137164 is about 16159.7389830405. The cubic root of 261137164 is about 639.1795835225.

The spelling of 261137164 in words is "two hundred sixty-one million, one hundred thirty-seven thousand, one hundred sixty-four".