656212545139 has 2 divisors, whose sum is σ = 656212545140. Its totient is φ = 656212545138.

The previous prime is 656212545091. The next prime is 656212545151. The reversal of 656212545139 is 931545212656.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-656212545139 is a prime.

It is a super-2 number, since 2×656212545139² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 656212545092 and 656212545101.

It is not a weakly prime, because it can be changed into another prime (656212545179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328106272569 + 328106272570.

It is an arithmetic number, because the mean of its divisors is an integer number (328106272570).

Almost surely, 2^656212545139 is an apocalyptic number.

656212545139 is a deficient number, since it is larger than the sum of its proper divisors (1).

656212545139 is an equidigital number, since it uses as much as digits as its factorization.

656212545139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944000, while the sum is 49.

The spelling of 656212545139 in words is "six hundred fifty-six billion, two hundred twelve million, five hundred forty-five thousand, one hundred thirty-nine".