156420661 has 8 divisors (see below), whose sum is σ = 157308480. Its totient is φ = 155536128.

The previous prime is 156420659. The next prime is 156420683. The reversal of 156420661 is 166024651.

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

It is a cyclic number.

It is not a de Polignac number, because 156420661 - 2¹ = 156420659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156420601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 241440 + ... + 242086.

It is an arithmetic number, because the mean of its divisors is an integer number (19663560).

Almost surely, 2^156420661 is an apocalyptic number.

It is an amenable number.

156420661 is a deficient number, since it is larger than the sum of its proper divisors (887819).

156420661 is an equidigital number, since it uses as much as digits as its factorization.

156420661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1643.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 156420661 is about 12506.8245770059. The cubic root of 156420661 is about 538.8046960796.

The spelling of 156420661 in words is "one hundred fifty-six million, four hundred twenty thousand, six hundred sixty-one".