6621345431 has 8 divisors (see below), whose sum is σ = 6691555584. Its totient is φ = 6551289720.

The previous prime is 6621345427. The next prime is 6621345443. The reversal of 6621345431 is 1345431266.

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

It is a cyclic number.

It is not a de Polignac number, because 6621345431 - 2² = 6621345427 is a prime.

It is a super-2 number, since 2×6621345431² = 87684430633249151522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6621345391 and 6621345400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6621345461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48626 + ... + 124928.

It is an arithmetic number, because the mean of its divisors is an integer number (836444448).

Almost surely, 2^6621345431 is an apocalyptic number.

6621345431 is a deficient number, since it is larger than the sum of its proper divisors (70210153).

6621345431 is a wasteful number, since it uses less digits than its factorization.

6621345431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77221.

The product of its digits is 51840, while the sum is 35.

The square root of 6621345431 is about 81371.6500447177. The cubic root of 6621345431 is about 1877.7974650238.

Adding to 6621345431 its reverse (1345431266), we get a palindrome (7966776697).

The spelling of 6621345431 in words is "six billion, six hundred twenty-one million, three hundred forty-five thousand, four hundred thirty-one".