261652337256651 has 32 divisors (see below), whose sum is σ = 393515842062336. Its totient is φ = 153206436960000.

The previous prime is 261652337256643. The next prime is 261652337256683. The reversal of 261652337256651 is 156652733256162.

It is not a de Polignac number, because 261652337256651 - 2³ = 261652337256643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261652337256601) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 212171896 + ... + 213401541.

It is an arithmetic number, because the mean of its divisors is an integer number (12297370064448).

Almost surely, 2^{261652337256651} is an apocalyptic number.

261652337256651 is a deficient number, since it is larger than the sum of its proper divisors (131863504805685).

261652337256651 is a wasteful number, since it uses less digits than its factorization.

261652337256651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425574083.

The product of its digits is 81648000, while the sum is 60.

The spelling of 261652337256651 in words is "two hundred sixty-one trillion, six hundred fifty-two billion, three hundred thirty-seven million, two hundred fifty-six thousand, six hundred fifty-one".