55491668 has 6 divisors (see below), whose sum is σ = 97110426. Its totient is φ = 27745832.

The previous prime is 55491661. The next prime is 55491673. The reversal of 55491668 is 86619455.

It can be written as a sum of positive squares in only one way, i.e., 54434884 + 1056784 = 7378^2 + 1028^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55491661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6936455 + ... + 6936462.

It is an arithmetic number, because the mean of its divisors is an integer number (16185071).

Almost surely, 2^55491668 is an apocalyptic number.

It is an amenable number.

55491668 is a deficient number, since it is larger than the sum of its proper divisors (41618758).

55491668 is a wasteful number, since it uses less digits than its factorization.

55491668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13872921 (or 13872919 counting only the distinct ones).

The product of its digits is 259200, while the sum is 44.

The square root of 55491668 is about 7449.2729846610. The cubic root of 55491668 is about 381.4250920916.

The spelling of 55491668 in words is "fifty-five million, four hundred ninety-one thousand, six hundred sixty-eight".