55643503 has 2 divisors, whose sum is σ = 55643504. Its totient is φ = 55643502.

The previous prime is 55643461. The next prime is 55643551. The reversal of 55643503 is 30534655.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55643503 is a prime.

It is a super-2 number, since 2×55643503² = 6192398852222018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55643303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27821751 + 27821752.

It is an arithmetic number, because the mean of its divisors is an integer number (27821752).

Almost surely, 2^55643503 is an apocalyptic number.

55643503 is a deficient number, since it is larger than the sum of its proper divisors (1).

55643503 is an equidigital number, since it uses as much as digits as its factorization.

55643503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27000, while the sum is 31.

The square root of 55643503 is about 7459.4572858888. The cubic root of 55643503 is about 381.7726574133.

The spelling of 55643503 in words is "fifty-five million, six hundred forty-three thousand, five hundred three".