156561235666 has 8 divisors (see below), whose sum is σ = 256191112944. Its totient is φ = 71164198020.

The previous prime is 156561235661. The next prime is 156561235673. The reversal of 156561235666 is 666532165651.

156561235666 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×156561235666² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (156561235661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3558209880 + ... + 3558209923.

It is an arithmetic number, because the mean of its divisors is an integer number (32023889118).

Almost surely, 2^156561235666 is an apocalyptic number.

156561235666 is a deficient number, since it is larger than the sum of its proper divisors (99629877278).

156561235666 is a wasteful number, since it uses less digits than its factorization.

156561235666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7116419816.

The product of its digits is 5832000, while the sum is 52.

The spelling of 156561235666 in words is "one hundred fifty-six billion, five hundred sixty-one million, two hundred thirty-five thousand, six hundred sixty-six".