155601864 has 128 divisors (see below), whose sum is σ = 482803200. Its totient is φ = 46025280.

The previous prime is 155601863. The next prime is 155601883. The reversal of 155601864 is 468106551.

155601864 is a `hidden beast` number, since 15 + 560 + 1 + 86 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (155601863) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 101407 + ... + 102929.

It is an arithmetic number, because the mean of its divisors is an integer number (3771900).

Almost surely, 2^155601864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155601864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (241401600).

155601864 is an abundant number, since it is smaller than the sum of its proper divisors (327201336).

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

155601864 is a wasteful number, since it uses less digits than its factorization.

155601864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1592 (or 1582 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 155601864 is about 12474.0476189567. The cubic root of 155601864 is about 537.8629115019.

It can be divided in two parts, 15560 and 1864, that added together give a square (17424 = 132²).

The spelling of 155601864 in words is "one hundred fifty-five million, six hundred one thousand, eight hundred sixty-four".