55158817 has 8 divisors (see below), whose sum is σ = 64576512. Its totient is φ = 46125600.

The previous prime is 55158811. The next prime is 55158839. The reversal of 55158817 is 71885155.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55158817 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55158817.

It is not an unprimeable number, because it can be changed into a prime (55158811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95809 + ... + 96382.

It is an arithmetic number, because the mean of its divisors is an integer number (8072064).

Almost surely, 2^55158817 is an apocalyptic number.

It is an amenable number.

55158817 is a deficient number, since it is larger than the sum of its proper divisors (9417695).

55158817 is a wasteful number, since it uses less digits than its factorization.

55158817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192239.

The product of its digits is 56000, while the sum is 40.

The square root of 55158817 is about 7426.8982085390. The cubic root of 55158817 is about 380.6609388584.

The spelling of 55158817 in words is "fifty-five million, one hundred fifty-eight thousand, eight hundred seventeen".