55213601638 has 24 divisors (see below), whose sum is σ = 89712590688. Its totient is φ = 25474299552.

The previous prime is 55213601633. The next prime is 55213601647. The reversal of 55213601638 is 83610631255.

It is a self number, because there is not a number n which added to its sum of digits gives 55213601638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55213601633) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 994756 + ... + 1048792.

It is an arithmetic number, because the mean of its divisors is an integer number (3738024612).

Almost surely, 2^55213601638 is an apocalyptic number.

55213601638 is a deficient number, since it is larger than the sum of its proper divisors (34498989050).

55213601638 is a wasteful number, since it uses less digits than its factorization.

55213601638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57088 (or 57075 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 40.

The spelling of 55213601638 in words is "fifty-five billion, two hundred thirteen million, six hundred one thousand, six hundred thirty-eight".