261312713537 has 8 divisors (see below), whose sum is σ = 265755016800. Its totient is φ = 256870852864.

The previous prime is 261312713483. The next prime is 261312713539. The reversal of 261312713537 is 735317213162.

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 261312713537 - 2²⁰ = 261311664961 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261312713494 and 261312713503.

It is not an unprimeable number, because it can be changed into a prime (261312713539) 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, 1213793 + ... + 1412769.

It is an arithmetic number, because the mean of its divisors is an integer number (33219377100).

Almost surely, 2^261312713537 is an apocalyptic number.

It is an amenable number.

261312713537 is a deficient number, since it is larger than the sum of its proper divisors (4442303263).

261312713537 is a wasteful number, since it uses less digits than its factorization.

261312713537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221295.

The product of its digits is 158760, while the sum is 41.

Adding to 261312713537 its reverse (735317213162), we get a palindrome (996629926699).

The spelling of 261312713537 in words is "two hundred sixty-one billion, three hundred twelve million, seven hundred thirteen thousand, five hundred thirty-seven".