261677263936 has 63 divisors (see below), whose sum is σ = 570861461653. Its totient is φ = 118923749120.

The previous prime is 261677263933. The next prime is 261677263979. The reversal of 261677263936 is 639362776162.

The square root of 261677263936 is 511544.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 181782849600 + 79894414336 = 426360^2 + 282656^2 .

It is a super-2 number, since 2×261677263936² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261677263933) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 45012966 + ... + 45018778.

Almost surely, 2^261677263936 is an apocalyptic number.

261677263936 is the 511544-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261677263936

261677263936 is an abundant number, since it is smaller than the sum of its proper divisors (309184197717).

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

261677263936 is an frugal number, since it uses more digits than its factorization.

261677263936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11660 (or 5826 counting only the distinct ones).

The product of its digits is 20575296, while the sum is 58.

The spelling of 261677263936 in words is "two hundred sixty-one billion, six hundred seventy-seven million, two hundred sixty-three thousand, nine hundred thirty-six".