261441957938 has 24 divisors (see below), whose sum is σ = 459781604352. Its totient is φ = 111164291784.

The previous prime is 261441957913. The next prime is 261441957977. The reversal of 261441957938 is 839759144162.

It is a happy number.

It is a super-2 number, since 2×261441957938² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10490606 + ... + 10515497.

It is an arithmetic number, because the mean of its divisors is an integer number (19157566848).

Almost surely, 2^261441957938 is an apocalyptic number.

261441957938 is a deficient number, since it is larger than the sum of its proper divisors (198339646414).

261441957938 is a wasteful number, since it uses less digits than its factorization.

261441957938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21006246 (or 21006239 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 59.

The spelling of 261441957938 in words is "two hundred sixty-one billion, four hundred forty-one million, nine hundred fifty-seven thousand, nine hundred thirty-eight".