155660066172000 has 3456 divisors, whose sum is σ = 655140103188480. Its totient is φ = 36057324441600.

The previous prime is 155660066171999. The next prime is 155660066172047. The reversal of 155660066172000 is 271660066551.

155660066172000 is a `hidden beast` number, since 1 + 5 + 5 + 6 + 6 + 0 + 0 + 6 + 617 + 20 + 0 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 575 ways as a sum of consecutive naturals, for example, 651297347881 + ... + 651297348119.

It is an arithmetic number, because the mean of its divisors is an integer number (189566002080).

Almost surely, 2^{155660066172000} is an apocalyptic number.

155660066172000 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 155660066172000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (327570051594240).

155660066172000 is an abundant number, since it is smaller than the sum of its proper divisors (499480037016480).

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

155660066172000 is an equidigital number, since it uses as much as digits as its factorization.

155660066172000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407 (or 368 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 45.

The spelling of 155660066172000 in words is "one hundred fifty-five trillion, six hundred sixty billion, sixty-six million, one hundred seventy-two thousand".