156215800561 has 2 divisors, whose sum is σ = 156215800562. Its totient is φ = 156215800560.

The previous prime is 156215800523. The next prime is 156215800583. The reversal of 156215800561 is 165008512651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153926752225 + 2289048336 = 392335^2 + 47844^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-156215800561 is a prime.

It is not a weakly prime, because it can be changed into another prime (156215800361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78107900280 + 78107900281.

It is an arithmetic number, because the mean of its divisors is an integer number (78107900281).

Almost surely, 2^156215800561 is an apocalyptic number.

It is an amenable number.

156215800561 is a deficient number, since it is larger than the sum of its proper divisors (1).

156215800561 is an equidigital number, since it uses as much as digits as its factorization.

156215800561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72000, while the sum is 40.

The spelling of 156215800561 in words is "one hundred fifty-six billion, two hundred fifteen million, eight hundred thousand, five hundred sixty-one".