261868172 has 6 divisors (see below), whose sum is σ = 458269308. Its totient is φ = 130934084.

The previous prime is 261868169. The next prime is 261868183. The reversal of 261868172 is 271868162.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32733518 + ... + 32733525.

It is an arithmetic number, because the mean of its divisors is an integer number (76378218).

Almost surely, 2^261868172 is an apocalyptic number.

It is an amenable number.

261868172 is a deficient number, since it is larger than the sum of its proper divisors (196401136).

261868172 is a wasteful number, since it uses less digits than its factorization.

261868172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65467047 (or 65467045 counting only the distinct ones).

The product of its digits is 64512, while the sum is 41.

The square root of 261868172 is about 16182.3413633504. The cubic root of 261868172 is about 639.7754518240.

The spelling of 261868172 in words is "two hundred sixty-one million, eight hundred sixty-eight thousand, one hundred seventy-two".