261795179749 has 8 divisors (see below), whose sum is σ = 275743281440. Its totient is φ = 247864018896.

The previous prime is 261795179743. The next prime is 261795179753. The reversal of 261795179749 is 947971597162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261795179749 - 2⁹ = 261795179237 is a prime.

It is a super-2 number, since 2×261795179749² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261795179743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4203474 + ... + 4265299.

It is an arithmetic number, because the mean of its divisors is an integer number (34467910180).

Almost surely, 2^261795179749 is an apocalyptic number.

It is an amenable number.

261795179749 is a deficient number, since it is larger than the sum of its proper divisors (13948101691).

261795179749 is a wasteful number, since it uses less digits than its factorization.

261795179749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8470419.

The product of its digits is 60011280, while the sum is 67.

The spelling of 261795179749 in words is "two hundred sixty-one billion, seven hundred ninety-five million, one hundred seventy-nine thousand, seven hundred forty-nine".