261544465413631 has 8 divisors (see below), whose sum is σ = 281623153188240. Its totient is φ = 241987301996928.

The previous prime is 261544465413629. The next prime is 261544465413653. The reversal of 261544465413631 is 136314564445162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261544465413631 - 2¹ = 261544465413629 is a prime.

It is a super-2 number, since 2×261544465413631² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261544465413601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130381088436 + ... + 130381090441.

It is an arithmetic number, because the mean of its divisors is an integer number (35202894148530).

Almost surely, 2^{261544465413631} is an apocalyptic number.

261544465413631 is a deficient number, since it is larger than the sum of its proper divisors (20078687774609).

261544465413631 is a wasteful number, since it uses less digits than its factorization.

261544465413631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260762178953.

The product of its digits is 24883200, while the sum is 55.

The spelling of 261544465413631 in words is "two hundred sixty-one trillion, five hundred forty-four billion, four hundred sixty-five million, four hundred thirteen thousand, six hundred thirty-one".