261630262088 has 64 divisors (see below), whose sum is σ = 530700251760. Its totient is φ = 120202592256.

The previous prime is 261630262081. The next prime is 261630262183. The reversal of 261630262088 is 880262036162.

It can be written as a sum of positive squares in 8 ways, for example, as 41592339364 + 220037922724 = 203942^2 + 469082^2 .

It is not an unprimeable number, because it can be changed into a prime (261630262081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62995820 + ... + 62999972.

Almost surely, 2^261630262088 is an apocalyptic number.

It is an amenable number.

261630262088 is an abundant number, since it is smaller than the sum of its proper divisors (269069989672).

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

261630262088 is a wasteful number, since it uses less digits than its factorization.

261630262088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6786 (or 6782 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 44.

The spelling of 261630262088 in words is "two hundred sixty-one billion, six hundred thirty million, two hundred sixty-two thousand, eighty-eight".