261653572 has 6 divisors (see below), whose sum is σ = 457893758. Its totient is φ = 130826784.

The previous prime is 261653563. The next prime is 261653597. The reversal of 261653572 is 275356162.

It can be written as a sum of positive squares in only one way, i.e., 205463556 + 56190016 = 14334^2 + 7496^2 .

It is a nialpdrome in base 16.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32706693 + ... + 32706700.

Almost surely, 2^261653572 is an apocalyptic number.

It is an amenable number.

261653572 is a deficient number, since it is larger than the sum of its proper divisors (196240186).

261653572 is a wasteful number, since it uses less digits than its factorization.

261653572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65413397 (or 65413395 counting only the distinct ones).

The product of its digits is 75600, while the sum is 37.

The square root of 261653572 is about 16175.7093198413. The cubic root of 261653572 is about 639.6006395225.

The spelling of 261653572 in words is "two hundred sixty-one million, six hundred fifty-three thousand, five hundred seventy-two".