261859511036 has 48 divisors (see below), whose sum is σ = 483399899136. Its totient is φ = 123871148544.

The previous prime is 261859511003. The next prime is 261859511057. The reversal of 261859511036 is 630115958162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16474685 + ... + 16490571.

It is an arithmetic number, because the mean of its divisors is an integer number (10070831232).

Almost surely, 2^261859511036 is an apocalyptic number.

It is an amenable number.

261859511036 is a deficient number, since it is larger than the sum of its proper divisors (221540388100).

261859511036 is a wasteful number, since it uses less digits than its factorization.

261859511036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17858 (or 17856 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 47.

The spelling of 261859511036 in words is "two hundred sixty-one billion, eight hundred fifty-nine million, five hundred eleven thousand, thirty-six".