155555580 has 24 divisors (see below), whose sum is σ = 435555792. Its totient is φ = 41481472.

The previous prime is 155555579. The next prime is 155555581. The reversal of 155555580 is 85555551.

It is an interprime number because it is at equal distance from previous prime (155555579) and next prime (155555581).

It is a super-3 number, since 3×155555580³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155555581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1296237 + ... + 1296356.

It is an arithmetic number, because the mean of its divisors is an integer number (18148158).

Almost surely, 2^155555580 is an apocalyptic number.

155555580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155555580 is an abundant number, since it is smaller than the sum of its proper divisors (280000212).

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

155555580 is a wasteful number, since it uses less digits than its factorization.

155555580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2592605 (or 2592603 counting only the distinct ones).

The product of its (nonzero) digits is 125000, while the sum is 39.

The square root of 155555580 is about 12472.1922692043. The cubic root of 155555580 is about 537.8095768458.

It can be divided in two parts, 15555 and 5580, that multiplied together give a triangular number (86796900 = T₁₃₁₇₅).

The spelling of 155555580 in words is "one hundred fifty-five million, five hundred fifty-five thousand, five hundred eighty".