13621894258 has 12 divisors (see below), whose sum is σ = 23768815662. Its totient is φ = 5837954640.

The previous prime is 13621894207. The next prime is 13621894267. The reversal of 13621894258 is 85249812631.

It can be written as a sum of positive squares in only one way, i.e., 7691816209 + 5930078049 = 87703^2 + 77007^2 .

It is a super-2 number, since 2×13621894258² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 69499363 + ... + 69499558.

Almost surely, 2^13621894258 is an apocalyptic number.

13621894258 is a deficient number, since it is larger than the sum of its proper divisors (10146921404).

13621894258 is a wasteful number, since it uses less digits than its factorization.

13621894258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138998937 (or 138998930 counting only the distinct ones).

The product of its digits is 829440, while the sum is 49.

The spelling of 13621894258 in words is "thirteen billion, six hundred twenty-one million, eight hundred ninety-four thousand, two hundred fifty-eight".