261564330031371 has 12 divisors (see below), whose sum is σ = 394241888743248. Its totient is φ = 166794645237264.

The previous prime is 261564330031343. The next prime is 261564330031379. The reversal of 261564330031371 is 173130033465162.

261564330031371 is a `hidden beast` number, since 2 + 6 + 1 + 564 + 3 + 3 + 0 + 0 + 3 + 13 + 71 = 666.

It is not a de Polignac number, because 261564330031371 - 2²⁷ = 261564195813643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261564330031379) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 631797898420 + ... + 631797898833.

It is an arithmetic number, because the mean of its divisors is an integer number (32853490728604).

Almost surely, 2^{261564330031371} is an apocalyptic number.

261564330031371 is a deficient number, since it is larger than the sum of its proper divisors (132677558711877).

261564330031371 is a wasteful number, since it uses less digits than its factorization.

261564330031371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1263595797282 (or 1263595797279 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 45.

The spelling of 261564330031371 in words is "two hundred sixty-one trillion, five hundred sixty-four billion, three hundred thirty million, thirty-one thousand, three hundred seventy-one".