638600070221 has 16 divisors (see below), whose sum is σ = 679672425600. Its totient is φ = 597918435840.

The previous prime is 638600070211. The next prime is 638600070223. The reversal of 638600070221 is 122070006836.

It is a happy number.

638600070221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 638600070221 - 2¹⁴ = 638600053837 is a prime.

It is a super-2 number, since 2×638600070221² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638600070223) 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, 29174201 + ... + 29196081.

It is an arithmetic number, because the mean of its divisors is an integer number (42479526600).

Almost surely, 2^638600070221 is an apocalyptic number.

It is an amenable number.

638600070221 is a deficient number, since it is larger than the sum of its proper divisors (41072355379).

638600070221 is a wasteful number, since it uses less digits than its factorization.

638600070221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30724.

The product of its (nonzero) digits is 24192, while the sum is 35.

The spelling of 638600070221 in words is "six hundred thirty-eight billion, six hundred million, seventy thousand, two hundred twenty-one".