155217473280 has 432 divisors, whose sum is σ = 545429626560. Its totient is φ = 40749760512.

The previous prime is 155217473207. The next prime is 155217473287. The reversal of 155217473280 is 82374712551.

155217473280 is a `hidden beast` number, since 1 + 5 + 521 + 7 + 47 + 3 + 2 + 80 = 666.

It is a super-2 number, since 2×155217473280² (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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155217473287) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 304945666 + ... + 304946174.

It is an arithmetic number, because the mean of its divisors is an integer number (1262568580).

Almost surely, 2^155217473280 is an apocalyptic number.

155217473280 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 155217473280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (272714813280).

155217473280 is an abundant number, since it is smaller than the sum of its proper divisors (390212153280).

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

155217473280 is a wasteful number, since it uses less digits than its factorization.

155217473280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 896 (or 879 counting only the distinct ones).

The product of its (nonzero) digits is 470400, while the sum is 45.

The spelling of 155217473280 in words is "one hundred fifty-five billion, two hundred seventeen million, four hundred seventy-three thousand, two hundred eighty".