156105666561 has 16 divisors (see below), whose sum is σ = 225478077440. Its totient is φ = 96065021520.

The previous prime is 156105666523. The next prime is 156105666571. The reversal of 156105666561 is 165666501651.

It is not a de Polignac number, because 156105666561 - 2²¹ = 156103569409 is a prime.

It is a super-2 number, since 2×156105666561² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 156105666561.

It is not an unprimeable number, because it can be changed into a prime (156105666571) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11835745 + ... + 11848926.

It is an arithmetic number, because the mean of its divisors is an integer number (14092379840).

Almost surely, 2^156105666561 is an apocalyptic number.

It is an amenable number.

156105666561 is a deficient number, since it is larger than the sum of its proper divisors (69372410879).

156105666561 is an equidigital number, since it uses as much as digits as its factorization.

156105666561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23684713 (or 23684687 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 48.

The spelling of 156105666561 in words is "one hundred fifty-six billion, one hundred five million, six hundred sixty-six thousand, five hundred sixty-one".