261125537578 has 16 divisors (see below), whose sum is σ = 418265602560. Its totient is φ = 121994132400.

The previous prime is 261125537551. The next prime is 261125537587. The reversal of 261125537578 is 875735521162.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72613758 + ... + 72617353.

It is an arithmetic number, because the mean of its divisors is an integer number (26141600160).

Almost surely, 2^261125537578 is an apocalyptic number.

261125537578 is a deficient number, since it is larger than the sum of its proper divisors (157140064982).

261125537578 is a wasteful number, since it uses less digits than its factorization.

261125537578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145231173.

The product of its digits is 3528000, while the sum is 52.

The spelling of 261125537578 in words is "two hundred sixty-one billion, one hundred twenty-five million, five hundred thirty-seven thousand, five hundred seventy-eight".