261541191250 has 40 divisors (see below), whose sum is σ = 497137665024. Its totient is φ = 103142970000.

The previous prime is 261541191229. The next prime is 261541191253. The reversal of 261541191250 is 52191145162.

It is not an unprimeable number, because it can be changed into a prime (261541191253) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1384722 + ... + 1562221.

Almost surely, 2^261541191250 is an apocalyptic number.

261541191250 is a deficient number, since it is larger than the sum of its proper divisors (235596473774).

261541191250 is an equidigital number, since it uses as much as digits as its factorization.

261541191250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2947036 (or 2947021 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 37.

The spelling of 261541191250 in words is "two hundred sixty-one billion, five hundred forty-one million, one hundred ninety-one thousand, two hundred fifty".