638544222361123 has 16 divisors (see below), whose sum is σ = 688751948900736. Its totient is φ = 588492243780480.

The previous prime is 638544222361099. The next prime is 638544222361217. The reversal of 638544222361123 is 321163222445836.

It is not a de Polignac number, because 638544222361123 - 2²⁵ = 638544188806691 is a prime.

It is a super-2 number, since 2×638544222361123² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638544222368123) 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, 79063590 + ... + 86764852.

It is an arithmetic number, because the mean of its divisors is an integer number (43046996806296).

Almost surely, 2^{638544222361123} is an apocalyptic number.

638544222361123 is a deficient number, since it is larger than the sum of its proper divisors (50207726539613).

638544222361123 is a wasteful number, since it uses less digits than its factorization.

638544222361123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7711374.

The product of its digits is 9953280, while the sum is 52.

The spelling of 638544222361123 in words is "six hundred thirty-eight trillion, five hundred forty-four billion, two hundred twenty-two million, three hundred sixty-one thousand, one hundred twenty-three".