155117700 has 144 divisors (see below), whose sum is σ = 506148160. Its totient is φ = 40746240.

The previous prime is 155117689. The next prime is 155117717. The reversal of 155117700 is 7711551.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 196707 + ... + 197493.

Almost surely, 2^155117700 is an apocalyptic number.

155117700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155117700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (253074080).

155117700 is an abundant number, since it is smaller than the sum of its proper divisors (351030460).

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

155117700 is a wasteful number, since it uses less digits than its factorization.

155117700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 883 (or 870 counting only the distinct ones).

The product of its (nonzero) digits is 1225, while the sum is 27.

The square root of 155117700 is about 12454.6256467226. The cubic root of 155117700 is about 537.3044682688.

It can be divided in two parts, 155 and 117700, that added together give a triangular number (117855 = T₄₈₅).

The spelling of 155117700 in words is "one hundred fifty-five million, one hundred seventeen thousand, seven hundred".