5621666426 has 8 divisors (see below), whose sum is σ = 8570737524. Its totient is φ = 2764753920.

The previous prime is 5621666411. The next prime is 5621666431. The reversal of 5621666426 is 6246661265.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5558448025 + 63218401 = 74555^2 + 7951^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×5621666426² = 63206266810431226952, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23039495 + ... + 23039738.

Almost surely, 2^5621666426 is an apocalyptic number.

5621666426 is a deficient number, since it is larger than the sum of its proper divisors (2949071098).

5621666426 is a wasteful number, since it uses less digits than its factorization.

5621666426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46079296.

The product of its digits is 622080, while the sum is 44.

The square root of 5621666426 is about 74977.7728797008. The cubic root of 5621666426 is about 1778.0952593521.

The spelling of 5621666426 in words is "five billion, six hundred twenty-one million, six hundred sixty-six thousand, four hundred twenty-six".