155505157 has 4 divisors (see below), whose sum is σ = 159121600. Its totient is φ = 151888716.

The previous prime is 155505151. The next prime is 155505173. The reversal of 155505157 is 751505551.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 155505157 - 2¹¹ = 155503109 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 (155505151) 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, 1808157 + ... + 1808242.

It is an arithmetic number, because the mean of its divisors is an integer number (39780400).

Almost surely, 2^155505157 is an apocalyptic number.

It is an amenable number.

155505157 is a deficient number, since it is larger than the sum of its proper divisors (3616443).

155505157 is an equidigital number, since it uses as much as digits as its factorization.

155505157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3616442.

The product of its (nonzero) digits is 21875, while the sum is 34.

The square root of 155505157 is about 12470.1706884870. The cubic root of 155505157 is about 537.7514606345.

The spelling of 155505157 in words is "one hundred fifty-five million, five hundred five thousand, one hundred fifty-seven".