55642669 has 4 divisors (see below), whose sum is σ = 56135196. Its totient is φ = 55150144.

The previous prime is 55642667. The next prime is 55642703. The reversal of 55642669 is 96624655.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14516100 + 41126569 = 3810^2 + 6413^2 .

It is a cyclic number.

It is not a de Polignac number, because 55642669 - 2¹ = 55642667 is a prime.

It is a super-2 number, since 2×55642669² = 6192213226887122, 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 (55642661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 246094 + ... + 246319.

It is an arithmetic number, because the mean of its divisors is an integer number (14033799).

Almost surely, 2^55642669 is an apocalyptic number.

It is an amenable number.

55642669 is a deficient number, since it is larger than the sum of its proper divisors (492527).

55642669 is a wasteful number, since it uses less digits than its factorization.

55642669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492526.

The product of its digits is 388800, while the sum is 43.

The square root of 55642669 is about 7459.4013834892. The cubic root of 55642669 is about 381.7707500329.

The spelling of 55642669 in words is "fifty-five million, six hundred forty-two thousand, six hundred sixty-nine".