55817645 has 16 divisors (see below), whose sum is σ = 74086320. Its totient is φ = 40103424.

The previous prime is 55817627. The next prime is 55817651. The reversal of 55817645 is 54671855.

It can be written as a sum of positive squares in 8 ways, for example, as 434281 + 55383364 = 659^2 + 7442^2 .

It is a cyclic number.

It is not a de Polignac number, because 55817645 - 2⁶ = 55817581 is a prime.

It is a super-3 number, since 3×55817645³ (a number of 24 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9200 + ... + 14009.

It is an arithmetic number, because the mean of its divisors is an integer number (4630395).

Almost surely, 2^55817645 is an apocalyptic number.

It is an amenable number.

55817645 is a deficient number, since it is larger than the sum of its proper divisors (18268675).

55817645 is a wasteful number, since it uses less digits than its factorization.

55817645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23264.

The product of its digits is 168000, while the sum is 41.

The square root of 55817645 is about 7471.1207325273. The cubic root of 55817645 is about 382.1705081124.

The spelling of 55817645 in words is "fifty-five million, eight hundred seventeen thousand, six hundred forty-five".