55997697 has 16 divisors (see below), whose sum is σ = 85662720. Its totient is φ = 31873872.

The previous prime is 55997671. The next prime is 55997699. The reversal of 55997697 is 79679955.

It is not a de Polignac number, because 55997697 - 2¹² = 55993601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55997699) 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, 454 + ... + 10592.

It is an arithmetic number, because the mean of its divisors is an integer number (5353920).

Almost surely, 2^55997697 is an apocalyptic number.

It is an amenable number.

55997697 is a deficient number, since it is larger than the sum of its proper divisors (29665023).

55997697 is a wasteful number, since it uses less digits than its factorization.

55997697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10412.

The product of its digits is 5358150, while the sum is 57.

The square root of 55997697 is about 7483.1608963058. The cubic root of 55997697 is about 382.5809918629.

The spelling of 55997697 in words is "fifty-five million, nine hundred ninety-seven thousand, six hundred ninety-seven".