155278771200 has 1056 divisors, whose sum is σ = 662795673600. Its totient is φ = 34889564160.

The previous prime is 155278771187. The next prime is 155278771243. The reversal of 155278771200 is 2177872551.

155278771200 is a `hidden beast` number, since 1 + 552 + 7 + 8 + 7 + 71 + 20 + 0 = 666.

It is a super-2 number, since 2×155278771200² (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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 324172561 + ... + 324173039.

Almost surely, 2^155278771200 is an apocalyptic number.

155278771200 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 155278771200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (331397836800).

155278771200 is an abundant number, since it is smaller than the sum of its proper divisors (507516902400).

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

155278771200 is a wasteful number, since it uses less digits than its factorization.

155278771200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592 (or 563 counting only the distinct ones).

The product of its (nonzero) digits is 274400, while the sum is 45.

The spelling of 155278771200 in words is "one hundred fifty-five billion, two hundred seventy-eight million, seven hundred seventy-one thousand, two hundred".