155442180906 has 24 divisors (see below), whose sum is σ = 337541501700. Its totient is φ = 51698658816.

The previous prime is 155442180899. The next prime is 155442180947. The reversal of 155442180906 is 609081244551.

155442180906 is a `hidden beast` number, since 1 + 5 + 544 + 2 + 18 + 0 + 90 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 145904900625 + 9537280281 = 381975^2 + 97659^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9608485 + ... + 9624648.

Almost surely, 2^155442180906 is an apocalyptic number.

155442180906 is an abundant number, since it is smaller than the sum of its proper divisors (182099320794).

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

155442180906 is a wasteful number, since it uses less digits than its factorization.

155442180906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19233590 (or 19233587 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The spelling of 155442180906 in words is "one hundred fifty-five billion, four hundred forty-two million, one hundred eighty thousand, nine hundred six".