155638155 has 16 divisors (see below), whose sum is σ = 250516224. Its totient is φ = 82508640.

The previous prime is 155638151. The next prime is 155638159. The reversal of 155638155 is 551836551.

155638155 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (155638151) and next prime (155638159).

It is not a de Polignac number, because 155638155 - 2² = 155638151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155638151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28561 + ... + 33570.

It is an arithmetic number, because the mean of its divisors is an integer number (15657264).

Almost surely, 2^155638155 is an apocalyptic number.

155638155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

155638155 is a deficient number, since it is larger than the sum of its proper divisors (94878069).

155638155 is a wasteful number, since it uses less digits than its factorization.

155638155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62306.

The product of its digits is 90000, while the sum is 39.

The square root of 155638155 is about 12475.5021943006. The cubic root of 155638155 is about 537.9047234809.

The spelling of 155638155 in words is "one hundred fifty-five million, six hundred thirty-eight thousand, one hundred fifty-five".