261594897439 has 8 divisors (see below), whose sum is σ = 277595176320. Its totient is φ = 245980167576.

The previous prime is 261594897359. The next prime is 261594897457. The reversal of 261594897439 is 934798495162.

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 261594897439 - 2²³ = 261586508831 is a prime.

It is a super-2 number, since 2×261594897439² (a number of 24 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 (261594897539) 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, 96385857 + ... + 96388570.

It is an arithmetic number, because the mean of its divisors is an integer number (34699397040).

Almost surely, 2^261594897439 is an apocalyptic number.

261594897439 is a deficient number, since it is larger than the sum of its proper divisors (16000278881).

261594897439 is a wasteful number, since it uses less digits than its factorization.

261594897439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192774509.

The product of its digits is 117573120, while the sum is 67.

The spelling of 261594897439 in words is "two hundred sixty-one billion, five hundred ninety-four million, eight hundred ninety-seven thousand, four hundred thirty-nine".