261937795512 has 64 divisors (see below), whose sum is σ = 665190633600. Its totient is φ = 85935358080.

The previous prime is 261937795429. The next prime is 261937795513. The reversal of 261937795512 is 215597739162.

It is a happy number.

It is a super-2 number, since 2×261937795512² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261937795513) 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, 1813414 + ... + 1952522.

It is an arithmetic number, because the mean of its divisors is an integer number (10393603650).

Almost surely, 2^261937795512 is an apocalyptic number.

It is an amenable number.

261937795512 is an abundant number, since it is smaller than the sum of its proper divisors (403252838088).

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

261937795512 is a wasteful number, since it uses less digits than its factorization.

261937795512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140356 (or 140352 counting only the distinct ones).

The product of its digits is 7144200, while the sum is 57.

The spelling of 261937795512 in words is "two hundred sixty-one billion, nine hundred thirty-seven million, seven hundred ninety-five thousand, five hundred twelve".