261724337093 has 4 divisors (see below), whose sum is σ = 263722232928. Its totient is φ = 259726441260.

The previous prime is 261724337041. The next prime is 261724337111. The reversal of 261724337093 is 390733427162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261724337093 - 2²⁶ = 261657228229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261724337393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 998947721 + ... + 998947982.

It is an arithmetic number, because the mean of its divisors is an integer number (65930558232).

Almost surely, 2^261724337093 is an apocalyptic number.

It is an amenable number.

261724337093 is a deficient number, since it is larger than the sum of its proper divisors (1997895835).

261724337093 is a wasteful number, since it uses less digits than its factorization.

261724337093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1997895834.

The product of its (nonzero) digits is 1143072, while the sum is 47.

The spelling of 261724337093 in words is "two hundred sixty-one billion, seven hundred twenty-four million, three hundred thirty-seven thousand, ninety-three".