261206616928 has 24 divisors (see below), whose sum is σ = 519342122880. Its totient is φ = 129310204800.

The previous prime is 261206616919. The next prime is 261206616947. The reversal of 261206616928 is 829616602162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40406208 + ... + 40412671.

It is an arithmetic number, because the mean of its divisors is an integer number (21639255120).

Almost surely, 2^261206616928 is an apocalyptic number.

It is an amenable number.

261206616928 is a deficient number, since it is larger than the sum of its proper divisors (258135505952).

261206616928 is a wasteful number, since it uses less digits than its factorization.

261206616928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80818990 (or 80818982 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 49.

The spelling of 261206616928 in words is "two hundred sixty-one billion, two hundred six million, six hundred sixteen thousand, nine hundred twenty-eight".