261612955388 has 12 divisors (see below), whose sum is σ = 457853853912. Its totient is φ = 130797568560.

The previous prime is 261612955343. The next prime is 261612955393. The reversal of 261612955388 is 883559216162.

It is a hoax number, since the sum of its digits (56) 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 pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2160995 + ... + 2278842.

It is an arithmetic number, because the mean of its divisors is an integer number (38154487826).

Almost surely, 2^261612955388 is an apocalyptic number.

It is an amenable number.

261612955388 is a deficient number, since it is larger than the sum of its proper divisors (196240898524).

261612955388 is a wasteful number, since it uses less digits than its factorization.

261612955388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4454572 (or 4454570 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 56.

The spelling of 261612955388 in words is "two hundred sixty-one billion, six hundred twelve million, nine hundred fifty-five thousand, three hundred eighty-eight".