55803557 has 4 divisors (see below), whose sum is σ = 56749440. Its totient is φ = 54857676.

The previous prime is 55803547. The next prime is 55803619. The reversal of 55803557 is 75530855.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55803557 - 2⁸ = 55803301 is a prime.

It is a super-2 number, since 2×55803557² = 6228073947704498, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55803557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55803547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 472853 + ... + 472970.

It is an arithmetic number, because the mean of its divisors is an integer number (14187360).

Almost surely, 2^55803557 is an apocalyptic number.

It is an amenable number.

55803557 is a deficient number, since it is larger than the sum of its proper divisors (945883).

55803557 is an equidigital number, since it uses as much as digits as its factorization.

55803557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 945882.

The product of its (nonzero) digits is 105000, while the sum is 38.

The square root of 55803557 is about 7470.1778425952. The cubic root of 55803557 is about 382.1383529809.

The spelling of 55803557 in words is "fifty-five million, eight hundred three thousand, five hundred fifty-seven".