155561472 has 300 divisors, whose sum is σ = 526820448. Its totient is φ = 45619200.

The previous prime is 155561459. The next prime is 155561479. The reversal of 155561472 is 274165551.

155561472 is a `hidden beast` number, since 1 + 55 + 561 + 47 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155561479) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 5018097 + ... + 5018127.

Almost surely, 2^155561472 is an apocalyptic number.

155561472 is a gapful number since it is divisible by the number (12) 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 155561472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (263410224).

155561472 is an abundant number, since it is smaller than the sum of its proper divisors (371258976).

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

155561472 is an equidigital number, since it uses as much as digits as its factorization.

155561472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83 (or 47 counting only the distinct ones).

The product of its digits is 42000, while the sum is 36.

The square root of 155561472 is about 12472.4284724347. The cubic root of 155561472 is about 537.8163669891.

The spelling of 155561472 in words is "one hundred fifty-five million, five hundred sixty-one thousand, four hundred seventy-two".