55661403 has 48 divisors (see below), whose sum is σ = 91535616. Its totient is φ = 29937600.

The previous prime is 55661387. The next prime is 55661423. The reversal of 55661403 is 30416655.

It is not a de Polignac number, because 55661403 - 2⁴ = 55661387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55661423) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 341400 + ... + 341562.

It is an arithmetic number, because the mean of its divisors is an integer number (1906992).

Almost surely, 2^55661403 is an apocalyptic number.

55661403 is a deficient number, since it is larger than the sum of its proper divisors (35874213).

55661403 is a wasteful number, since it uses less digits than its factorization.

55661403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304 (or 297 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 55661403 is about 7460.6570086019. The cubic root of 55661403 is about 381.8135906014.

The spelling of 55661403 in words is "fifty-five million, six hundred sixty-one thousand, four hundred three".