261506044345264 has 20 divisors (see below), whose sum is σ = 507164207729200. Its totient is φ = 130624958479680.

The previous prime is 261506044345241. The next prime is 261506044345303. The reversal of 261506044345264 is 462543440605162.

It is a super-2 number, since 2×261506044345264² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8003963964 + ... + 8003996635.

It is an arithmetic number, because the mean of its divisors is an integer number (25358210386460).

Almost surely, 2^{261506044345264} is an apocalyptic number.

It is an amenable number.

261506044345264 is a deficient number, since it is larger than the sum of its proper divisors (245658163383936).

261506044345264 is a wasteful number, since it uses less digits than its factorization.

261506044345264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16007961628 (or 16007961622 counting only the distinct ones).

The product of its (nonzero) digits is 16588800, while the sum is 52.

The spelling of 261506044345264 in words is "two hundred sixty-one trillion, five hundred six billion, forty-four million, three hundred forty-five thousand, two hundred sixty-four".