261902366401 has 32 divisors (see below), whose sum is σ = 305727827328. Its totient is φ = 222139653120.

The previous prime is 261902366359. The next prime is 261902366417. The reversal of 261902366401 is 104663209162.

It is a cyclic number.

It is not a de Polignac number, because 261902366401 - 2⁹ = 261902365889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261902366471) 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, 25719531 + ... + 25729711.

It is an arithmetic number, because the mean of its divisors is an integer number (9553994604).

Almost surely, 2^261902366401 is an apocalyptic number.

It is an amenable number.

261902366401 is a deficient number, since it is larger than the sum of its proper divisors (43825460927).

261902366401 is a wasteful number, since it uses less digits than its factorization.

261902366401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12961.

The product of its (nonzero) digits is 93312, while the sum is 40.

The spelling of 261902366401 in words is "two hundred sixty-one billion, nine hundred two million, three hundred sixty-six thousand, four hundred one".