55415511 has 24 divisors (see below), whose sum is σ = 81934736. Its totient is φ = 36080640.

The previous prime is 55415501. The next prime is 55415537. The reversal of 55415511 is 11551455.

It is not a de Polignac number, because 55415511 - 2¹⁸ = 55153367 is a prime.

It is a super-2 number, since 2×55415511² = 6141757718782242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55415501) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 105696 + ... + 106218.

Almost surely, 2^55415511 is an apocalyptic number.

55415511 is a deficient number, since it is larger than the sum of its proper divisors (26519225).

55415511 is a wasteful number, since it uses less digits than its factorization.

55415511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783 (or 780 counting only the distinct ones).

The product of its digits is 2500, while the sum is 27.

The square root of 55415511 is about 7444.1595227400. The cubic root of 55415511 is about 381.2505224037.

Adding to 55415511 its reverse (11551455), we get a palindrome (66966966).

The spelling of 55415511 in words is "fifty-five million, four hundred fifteen thousand, five hundred eleven".