261561652 has 24 divisors (see below), whose sum is σ = 502119072. Its totient is φ = 118231200.

The previous prime is 261561637. The next prime is 261561661. The reversal of 261561652 is 256165162.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

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, 8458 + ... + 24385.

It is an arithmetic number, because the mean of its divisors is an integer number (20921628).

Almost surely, 2^261561652 is an apocalyptic number.

261561652 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

261561652 is a deficient number, since it is larger than the sum of its proper divisors (240557420).

261561652 is a wasteful number, since it uses less digits than its factorization.

261561652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33039 (or 33037 counting only the distinct ones).

The product of its digits is 21600, while the sum is 34.

The square root of 261561652 is about 16172.8677729090. The cubic root of 261561652 is about 639.5257326188.

The spelling of 261561652 in words is "two hundred sixty-one million, five hundred sixty-one thousand, six hundred fifty-two".