155551505 has 16 divisors (see below), whose sum is σ = 194641920. Its totient is φ = 119189952.

The previous prime is 155551493. The next prime is 155551541. The reversal of 155551505 is 505155551.

It is a cyclic number.

It is not a de Polignac number, because 155551505 - 2⁴ = 155551489 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14192 + ... + 22638.

It is an arithmetic number, because the mean of its divisors is an integer number (12165120).

Almost surely, 2^155551505 is an apocalyptic number.

It is an amenable number.

155551505 is a deficient number, since it is larger than the sum of its proper divisors (39090415).

155551505 is a wasteful number, since it uses less digits than its factorization.

155551505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8608.

The product of its (nonzero) digits is 15625, while the sum is 32.

The square root of 155551505 is about 12472.0289047131. The cubic root of 155551505 is about 537.8048805755.

The spelling of 155551505 in words is "one hundred fifty-five million, five hundred fifty-one thousand, five hundred five".