261057897728 has 36 divisors (see below), whose sum is σ = 521150487648. Its totient is φ = 130515310080.

The previous prime is 261057897719. The next prime is 261057897731. The reversal of 261057897728 is 827798750162.

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, 2673575 + ... + 2769497.

Almost surely, 2^261057897728 is an apocalyptic number.

It is an amenable number.

261057897728 is a deficient number, since it is larger than the sum of its proper divisors (260092589920).

261057897728 is an equidigital number, since it uses as much as digits as its factorization.

261057897728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106570 (or 106556 counting only the distinct ones).

The product of its (nonzero) digits is 23708160, while the sum is 62.

The spelling of 261057897728 in words is "two hundred sixty-one billion, fifty-seven million, eight hundred ninety-seven thousand, seven hundred twenty-eight".