156664427 has 2 divisors, whose sum is σ = 156664428. Its totient is φ = 156664426.

The previous prime is 156664423. The next prime is 156664429. The reversal of 156664427 is 724466651.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 156664427 - 2² = 156664423 is a prime.

Together with 156664429, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (156664423) 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 as a sum of consecutive naturals, namely, 78332213 + 78332214.

It is an arithmetic number, because the mean of its divisors is an integer number (78332214).

Almost surely, 2^156664427 is an apocalyptic number.

156664427 is a deficient number, since it is larger than the sum of its proper divisors (1).

156664427 is an equidigital number, since it uses as much as digits as its factorization.

156664427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 41.

The square root of 156664427 is about 12516.5661025698. The cubic root of 156664427 is about 539.0844419388.

The spelling of 156664427 in words is "one hundred fifty-six million, six hundred sixty-four thousand, four hundred twenty-seven".