55155442 has 32 divisors (see below), whose sum is σ = 90043200. Its totient is φ = 25256448.

The previous prime is 55155439. The next prime is 55155473. The reversal of 55155442 is 24455155.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 163498 + ... + 163834.

It is an arithmetic number, because the mean of its divisors is an integer number (2813850).

Almost surely, 2^55155442 is an apocalyptic number.

55155442 is a deficient number, since it is larger than the sum of its proper divisors (34887758).

55155442 is a wasteful number, since it uses less digits than its factorization.

55155442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490.

The product of its digits is 20000, while the sum is 31.

The square root of 55155442 is about 7426.6709904236. The cubic root of 55155442 is about 380.6531748723.

The spelling of 55155442 in words is "fifty-five million, one hundred fifty-five thousand, four hundred forty-two".