155178804240 has 80 divisors (see below), whose sum is σ = 534504777600. Its totient is φ = 41381013888.

The previous prime is 155178804233. The next prime is 155178804257. The reversal of 155178804240 is 42408871551.

155178804240 is a `hidden beast` number, since 1 + 55 + 178 + 8 + 0 + 424 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×155178804240² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35918860 + ... + 35923179.

It is an arithmetic number, because the mean of its divisors is an integer number (6681309720).

Almost surely, 2^155178804240 is an apocalyptic number.

155178804240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155178804240 is an abundant number, since it is smaller than the sum of its proper divisors (379325973360).

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

155178804240 is a wasteful number, since it uses less digits than its factorization.

155178804240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71842061 (or 71842049 counting only the distinct ones).

The product of its (nonzero) digits is 358400, while the sum is 45.

The spelling of 155178804240 in words is "one hundred fifty-five billion, one hundred seventy-eight million, eight hundred four thousand, two hundred forty".