55645791 has 16 divisors (see below), whose sum is σ = 77068800. Its totient is φ = 35687168.

The previous prime is 55645781. The next prime is 55645801. The reversal of 55645791 is 19754655.

It is an interprime number because it is at equal distance from previous prime (55645781) and next prime (55645801).

It is a cyclic number.

It is not a de Polignac number, because 55645791 - 2¹⁰ = 55644767 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55645721) 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, 4975 + ... + 11663.

It is an arithmetic number, because the mean of its divisors is an integer number (4816800).

Almost surely, 2^55645791 is an apocalyptic number.

55645791 is a deficient number, since it is larger than the sum of its proper divisors (21423009).

55645791 is a wasteful number, since it uses less digits than its factorization.

55645791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6798.

The product of its digits is 189000, while the sum is 42.

The square root of 55645791 is about 7459.6106466759. The cubic root of 55645791 is about 381.7778900330. Note that the first 3 decimals are identical.

The spelling of 55645791 in words is "fifty-five million, six hundred forty-five thousand, seven hundred ninety-one".