156615999493 has 2 divisors, whose sum is σ = 156615999494. Its totient is φ = 156615999492.

The previous prime is 156615999481. The next prime is 156615999563. The reversal of 156615999493 is 394999516651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109099411204 + 47516588289 = 330302^2 + 217983^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-156615999493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156615999443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78307999746 + 78307999747.

It is an arithmetic number, because the mean of its divisors is an integer number (78307999747).

Almost surely, 2^156615999493 is an apocalyptic number.

It is an amenable number.

156615999493 is a deficient number, since it is larger than the sum of its proper divisors (1).

156615999493 is an equidigital number, since it uses as much as digits as its factorization.

156615999493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70858800, while the sum is 67.

The spelling of 156615999493 in words is "one hundred fifty-six billion, six hundred fifteen million, nine hundred ninety-nine thousand, four hundred ninety-three".