261631505130 has 16 divisors (see below), whose sum is σ = 627915612384. Its totient is φ = 69768401360.

The previous prime is 261631505119. The next prime is 261631505141. The reversal of 261631505130 is 31505136162.

It is an interprime number because it is at equal distance from previous prime (261631505119) and next prime (261631505141).

It is a junction number, because it is equal to n+sod(n) for n = 261631505091 and 261631505100.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4360525056 + ... + 4360525115.

It is an arithmetic number, because the mean of its divisors is an integer number (39244725774).

Almost surely, 2^261631505130 is an apocalyptic number.

261631505130 is an abundant number, since it is smaller than the sum of its proper divisors (366284107254).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261631505130 is a wasteful number, since it uses less digits than its factorization.

261631505130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8721050181.

The product of its (nonzero) digits is 16200, while the sum is 33.

The spelling of 261631505130 in words is "two hundred sixty-one billion, six hundred thirty-one million, five hundred five thousand, one hundred thirty".