55985511 has 16 divisors (see below), whose sum is σ = 75732480. Its totient is φ = 36785280.

The previous prime is 55985509. The next prime is 55985521. The reversal of 55985511 is 11558955.

It is not a de Polignac number, because 55985511 - 2¹ = 55985509 is a prime.

It is a super-2 number, since 2×55985511² = 6268754883862242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55985511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55985521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80676 + ... + 81366.

It is an arithmetic number, because the mean of its divisors is an integer number (4733280).

Almost surely, 2^55985511 is an apocalyptic number.

55985511 is a deficient number, since it is larger than the sum of its proper divisors (19746969).

55985511 is a wasteful number, since it uses less digits than its factorization.

55985511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1046.

The product of its digits is 45000, while the sum is 39.

The square root of 55985511 is about 7482.3466238875. The cubic root of 55985511 is about 382.5532379228.

The spelling of 55985511 in words is "fifty-five million, nine hundred eighty-five thousand, five hundred eleven".