156004661 has 4 divisors (see below), whose sum is σ = 156268332. Its totient is φ = 155740992.

The previous prime is 156004643. The next prime is 156004663. The reversal of 156004661 is 166400651.

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

It can be written as a sum of positive squares in 2 ways, for example, as 33570436 + 122434225 = 5794^2 + 11065^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-156004661 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 (156004663) 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 3 ways as a sum of consecutive naturals, for example, 130946 + ... + 132131.

It is an arithmetic number, because the mean of its divisors is an integer number (39067083).

Almost surely, 2^156004661 is an apocalyptic number.

It is an amenable number.

156004661 is a deficient number, since it is larger than the sum of its proper divisors (263671).

156004661 is an equidigital number, since it uses as much as digits as its factorization.

156004661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263670.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 156004661 is about 12490.1825847343. The cubic root of 156004661 is about 538.3266225130.

The spelling of 156004661 in words is "one hundred fifty-six million, four thousand, six hundred sixty-one".