55577997 has 6 divisors (see below), whose sum is σ = 80279342. Its totient is φ = 37051992.

The previous prime is 55577989. The next prime is 55578011. The reversal of 55577997 is 79977555.

It can be written as a sum of positive squares in only one way, i.e., 46703556 + 8874441 = 6834^2 + 2979^2 .

It is not a de Polignac number, because 55577997 - 2³ = 55577989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55577987) 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 5 ways as a sum of consecutive naturals, for example, 3087658 + ... + 3087675.

Almost surely, 2^55577997 is an apocalyptic number.

It is an amenable number.

55577997 is a deficient number, since it is larger than the sum of its proper divisors (24701345).

55577997 is a wasteful number, since it uses less digits than its factorization.

55577997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6175339 (or 6175336 counting only the distinct ones).

The product of its digits is 3472875, while the sum is 54.

The square root of 55577997 is about 7455.0651908618. The cubic root of 55577997 is about 381.6227853502.

The spelling of 55577997 in words is "fifty-five million, five hundred seventy-seven thousand, nine hundred ninety-seven".