155615923 has 2 divisors, whose sum is σ = 155615924. Its totient is φ = 155615922.

The previous prime is 155615917. The next prime is 155616031. The reversal of 155615923 is 329516551.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155615923 is a prime.

It is a super-2 number, since 2×155615923² = 48432630982283858, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (155613923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77807961 + 77807962.

It is an arithmetic number, because the mean of its divisors is an integer number (77807962).

Almost surely, 2^155615923 is an apocalyptic number.

155615923 is a deficient number, since it is larger than the sum of its proper divisors (1).

155615923 is an equidigital number, since it uses as much as digits as its factorization.

155615923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40500, while the sum is 37.

The square root of 155615923 is about 12474.6111362238. The cubic root of 155615923 is about 537.8791100802.

The spelling of 155615923 in words is "one hundred fifty-five million, six hundred fifteen thousand, nine hundred twenty-three".