156415525152661 has 2 divisors, whose sum is σ = 156415525152662. Its totient is φ = 156415525152660.

The previous prime is 156415525152647. The next prime is 156415525152751. The reversal of 156415525152661 is 166251525514651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142091525646225 + 14323999506436 = 11920215^2 + 3784706^2 .

It is a cyclic number.

It is not a de Polignac number, because 156415525152661 - 2¹³ = 156415525144469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156415525152961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78207762576330 + 78207762576331.

It is an arithmetic number, because the mean of its divisors is an integer number (78207762576331).

Almost surely, 2^{156415525152661} is an apocalyptic number.

It is an amenable number.

156415525152661 is a deficient number, since it is larger than the sum of its proper divisors (1).

156415525152661 is an equidigital number, since it uses as much as digits as its factorization.

156415525152661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800000, while the sum is 55.

The spelling of 156415525152661 in words is "one hundred fifty-six trillion, four hundred fifteen billion, five hundred twenty-five million, one hundred fifty-two thousand, six hundred sixty-one".