155361106721520 has 1920 divisors, whose sum is σ = 649372570828800. Its totient is φ = 33408234086400.

The previous prime is 155361106721519. The next prime is 155361106721537. The reversal of 155361106721520 is 25127601163551.

155361106721520 is a `hidden beast` number, since 1 + 5 + 5 + 3 + 6 + 110 + 6 + 7 + 2 + 1 + 520 = 666.

It is a super-2 number, since 2×155361106721520² (a number of 29 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 an unprimeable number.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 187407848466 + ... + 187407849294.

It is an arithmetic number, because the mean of its divisors is an integer number (338214880640).

Almost surely, 2^{155361106721520} is an apocalyptic number.

155361106721520 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 155361106721520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (324686285414400).

155361106721520 is an abundant number, since it is smaller than the sum of its proper divisors (494011464107280).

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

155361106721520 is a wasteful number, since it uses less digits than its factorization.

155361106721520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1164 (or 1105 counting only the distinct ones).

The product of its (nonzero) digits is 378000, while the sum is 45.

The spelling of 155361106721520 in words is "one hundred fifty-five trillion, three hundred sixty-one billion, one hundred six million, seven hundred twenty-one thousand, five hundred twenty".