155505520 has 20 divisors (see below), whose sum is σ = 361550520. Its totient is φ = 62202176.

The previous prime is 155505503. The next prime is 155505529. The reversal of 155505520 is 25505551.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155505529) 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, 971830 + ... + 971989.

It is an arithmetic number, because the mean of its divisors is an integer number (18077526).

Almost surely, 2^155505520 is an apocalyptic number.

155505520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155505520 is an abundant number, since it is smaller than the sum of its proper divisors (206045000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155505520 is a wasteful number, since it uses less digits than its factorization.

155505520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1943832 (or 1943826 counting only the distinct ones).

The product of its (nonzero) digits is 6250, while the sum is 28.

The square root of 155505520 is about 12470.1852432111. The cubic root of 155505520 is about 537.7518790635.

It can be divided in two parts, 155505 and 520, that added together give a square (156025 = 395²).

The spelling of 155505520 in words is "one hundred fifty-five million, five hundred five thousand, five hundred twenty".