155661427 has 2 divisors, whose sum is σ = 155661428. Its totient is φ = 155661426.

The previous prime is 155661403. The next prime is 155661439. The reversal of 155661427 is 724166551.

It is a happy number.

155661427 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 155661427 - 2¹¹ = 155659379 is a prime.

It is not a weakly prime, because it can be changed into another prime (155661497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77830713 + 77830714.

It is an arithmetic number, because the mean of its divisors is an integer number (77830714).

Almost surely, 2^155661427 is an apocalyptic number.

155661427 is a deficient number, since it is larger than the sum of its proper divisors (1).

155661427 is an equidigital number, since it uses as much as digits as its factorization.

155661427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 37.

The square root of 155661427 is about 12476.4348673810. The cubic root of 155661427 is about 537.9315324487.

The spelling of 155661427 in words is "one hundred fifty-five million, six hundred sixty-one thousand, four hundred twenty-seven".