3121666357 has 6 divisors (see below), whose sum is σ = 3208317378. Its totient is φ = 3037295664.

The previous prime is 3121666291. The next prime is 3121666363. The reversal of 3121666357 is 7536661213.

It can be written as a sum of positive squares in 3 ways, for example, as 2213608401 + 908057956 = 47049^2 + 30134^2 .

It is not a de Polignac number, because 3121666357 - 2¹¹ = 3121664309 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 (3121666397) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1138758 + ... + 1141495.

It is an arithmetic number, because the mean of its divisors is an integer number (534719563).

Almost surely, 2^3121666357 is an apocalyptic number.

3121666357 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

It is an amenable number.

3121666357 is a deficient number, since it is larger than the sum of its proper divisors (86651021).

3121666357 is an equidigital number, since it uses as much as digits as its factorization.

3121666357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2280327 (or 2280290 counting only the distinct ones).

The product of its digits is 136080, while the sum is 40.

The square root of 3121666357 is about 55871.8744718664. The cubic root of 3121666357 is about 1461.4888104682.

The spelling of 3121666357 in words is "three billion, one hundred twenty-one million, six hundred sixty-six thousand, three hundred fifty-seven".