155542518422172 has 144 divisors (see below), whose sum is σ = 465998088308480. Its totient is φ = 44439706190592.

The previous prime is 155542518422107. The next prime is 155542518422251. The reversal of 155542518422172 is 271224815245551.

155542518422172 is a `hidden beast` number, since 1 + 5 + 5 + 5 + 42 + 5 + 1 + 8 + 422 + 172 = 666.

155542518422172 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×155542518422172² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 328648479 + ... + 329121417.

Almost surely, 2^{155542518422172} is an apocalyptic number.

155542518422172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

155542518422172 is an abundant number, since it is smaller than the sum of its proper divisors (310455569886308).

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

155542518422172 is a wasteful number, since it uses less digits than its factorization.

155542518422172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521302 (or 521288 counting only the distinct ones).

The product of its digits is 8960000, while the sum is 54.

The spelling of 155542518422172 in words is "one hundred fifty-five trillion, five hundred forty-two billion, five hundred eighteen million, four hundred twenty-two thousand, one hundred seventy-two".