404626646621 has 4 divisors (see below), whose sum is σ = 404818142652. Its totient is φ = 404435150592.

The previous prime is 404626646609. The next prime is 404626646759. The reversal of 404626646621 is 126646626404.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 133071014521 + 271555632100 = 364789^2 + 521110^2 .

It is a cyclic number.

It is not a de Polignac number, because 404626646621 - 2¹⁴ = 404626630237 is a prime.

It is a super-2 number, since 2×404626646621² (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 (404626646321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95744846 + ... + 95749071.

It is an arithmetic number, because the mean of its divisors is an integer number (101204535663).

Almost surely, 2^404626646621 is an apocalyptic number.

It is an amenable number.

404626646621 is a deficient number, since it is larger than the sum of its proper divisors (191496031).

404626646621 is a wasteful number, since it uses less digits than its factorization.

404626646621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191496030.

The product of its (nonzero) digits is 1990656, while the sum is 47.

The spelling of 404626646621 in words is "four hundred four billion, six hundred twenty-six million, six hundred forty-six thousand, six hundred twenty-one".