261554037770531 has 32 divisors (see below), whose sum is σ = 298375343884800. Its totient is φ = 227164857004800.

The previous prime is 261554037770527. The next prime is 261554037770563. The reversal of 261554037770531 is 135077730455162.

261554037770531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 261554037770531 - 2² = 261554037770527 is a prime.

It is a super-3 number, since 3×261554037770531³ (a number of 44 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261554037770731) 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, 2040170 + ... + 22962368.

It is an arithmetic number, because the mean of its divisors is an integer number (9324229496400).

Almost surely, 2^{261554037770531} is an apocalyptic number.

261554037770531 is a deficient number, since it is larger than the sum of its proper divisors (36821306114269).

261554037770531 is a wasteful number, since it uses less digits than its factorization.

261554037770531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20922827.

The product of its (nonzero) digits is 18522000, while the sum is 56.

The spelling of 261554037770531 in words is "two hundred sixty-one trillion, five hundred fifty-four billion, thirty-seven million, seven hundred seventy thousand, five hundred thirty-one".