156666624442 has 4 divisors (see below), whose sum is σ = 234999936666. Its totient is φ = 78333312220.

The previous prime is 156666624427. The next prime is 156666624451. The reversal of 156666624442 is 244426666651.

It is a happy number.

156666624442 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 152725421601 + 3941202841 = 390801^2 + 62779^2 .

It is a super-2 number, since 2×156666624442² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 156666624442.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39166656109 + ... + 39166656112.

Almost surely, 2^156666624442 is an apocalyptic number.

156666624442 is a deficient number, since it is larger than the sum of its proper divisors (78333312224).

156666624442 is an equidigital number, since it uses as much as digits as its factorization.

156666624442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78333312223.

The product of its digits is 9953280, while the sum is 52.

The spelling of 156666624442 in words is "one hundred fifty-six billion, six hundred sixty-six million, six hundred twenty-four thousand, four hundred forty-two".