51591660941 has 4 divisors (see below), whose sum is σ = 51592233984. Its totient is φ = 51591087900.

The previous prime is 51591660907. The next prime is 51591660943. The reversal of 51591660941 is 14906619515.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 51591660941 - 2¹⁸ = 51591398797 is a prime.

It is a super-2 number, since 2×51591660941² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51591660943) 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, 118715 + ... + 342456.

It is an arithmetic number, because the mean of its divisors is an integer number (12898058496).

Almost surely, 2^51591660941 is an apocalyptic number.

It is an amenable number.

51591660941 is a deficient number, since it is larger than the sum of its proper divisors (573043).

51591660941 is a wasteful number, since it uses less digits than its factorization.

51591660941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573042.

The product of its (nonzero) digits is 291600, while the sum is 47.

The spelling of 51591660941 in words is "fifty-one billion, five hundred ninety-one million, six hundred sixty thousand, nine hundred forty-one".