155657623 has 4 divisors (see below), whose sum is σ = 169808328. Its totient is φ = 141506920.

The previous prime is 155657611. The next prime is 155657639. The reversal of 155657623 is 326756551.

155657623 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 326756551 = 11 ⋅29705141.

It is a cyclic number.

It is not a de Polignac number, because 155657623 - 2¹⁷ = 155526551 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 (155657653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7075336 + ... + 7075357.

It is an arithmetic number, because the mean of its divisors is an integer number (42452082).

Almost surely, 2^155657623 is an apocalyptic number.

155657623 is a deficient number, since it is larger than the sum of its proper divisors (14150705).

155657623 is a wasteful number, since it uses less digits than its factorization.

155657623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14150704.

The product of its digits is 189000, while the sum is 40.

The square root of 155657623 is about 12476.2824190542. The cubic root of 155657623 is about 537.9271504848.

The spelling of 155657623 in words is "one hundred fifty-five million, six hundred fifty-seven thousand, six hundred twenty-three".