261345635944 has 8 divisors (see below), whose sum is σ = 490023067410. Its totient is φ = 130672817968.

The previous prime is 261345635927. The next prime is 261345635963. The reversal of 261345635944 is 449536543162.

It can be written as a sum of positive squares in only one way, i.e., 257241696100 + 4103939844 = 507190^2 + 64062^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×261345635944² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 261345635891 and 261345635900.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16334102239 + ... + 16334102254.

Almost surely, 2^261345635944 is an apocalyptic number.

It is an amenable number.

261345635944 is a deficient number, since it is larger than the sum of its proper divisors (228677431466).

261345635944 is a wasteful number, since it uses less digits than its factorization.

261345635944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32668204499 (or 32668204495 counting only the distinct ones).

The product of its digits is 9331200, while the sum is 52.

The spelling of 261345635944 in words is "two hundred sixty-one billion, three hundred forty-five million, six hundred thirty-five thousand, nine hundred forty-four".