831151957661 has 4 divisors (see below), whose sum is σ = 831369369792. Its totient is φ = 830934545532.

The previous prime is 831151957637. The next prime is 831151957687. The reversal of 831151957661 is 166759151138.

It is a happy number.

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 an emirpimes, since its reverse is a distinct semiprime: 166759151138 = 2 ⋅83379575569.

It is a cyclic number.

It is not a de Polignac number, because 831151957661 - 2²² = 831147763357 is a prime.

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 (831151957061) 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, 108700331 + ... + 108707976.

It is an arithmetic number, because the mean of its divisors is an integer number (207842342448).

Almost surely, 2^831151957661 is an apocalyptic number.

It is an amenable number.

831151957661 is a deficient number, since it is larger than the sum of its proper divisors (217412131).

831151957661 is a wasteful number, since it uses less digits than its factorization.

831151957661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217412130.

The product of its digits is 1360800, while the sum is 53.

The spelling of 831151957661 in words is "eight hundred thirty-one billion, one hundred fifty-one million, nine hundred fifty-seven thousand, six hundred sixty-one".