55137985 has 24 divisors (see below), whose sum is σ = 78140160. Its totient is φ = 37233504.

The previous prime is 55137959. The next prime is 55137991. The reversal of 55137985 is 58973155.

It is not a de Polignac number, because 55137985 - 2¹¹ = 55135937 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14736 + ... + 18094.

It is an arithmetic number, because the mean of its divisors is an integer number (3255840).

Almost surely, 2^55137985 is an apocalyptic number.

It is an amenable number.

55137985 is a deficient number, since it is larger than the sum of its proper divisors (23002175).

55137985 is a wasteful number, since it uses less digits than its factorization.

55137985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3445 (or 3438 counting only the distinct ones).

The product of its digits is 189000, while the sum is 43.

The square root of 55137985 is about 7425.4956063552. The cubic root of 55137985 is about 380.6130110285.

The spelling of 55137985 in words is "fifty-five million, one hundred thirty-seven thousand, nine hundred eighty-five".