6621233651 has 2 divisors, whose sum is σ = 6621233652. Its totient is φ = 6621233650.

The previous prime is 6621233609. The next prime is 6621233683. The reversal of 6621233651 is 1563321266.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6621233651 is a prime.

It is a super-2 number, since 2×6621233651² = 87681470122269579602, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6621233251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3310616825 + 3310616826.

It is an arithmetic number, because the mean of its divisors is an integer number (3310616826).

Almost surely, 2^6621233651 is an apocalyptic number.

6621233651 is a deficient number, since it is larger than the sum of its proper divisors (1).

6621233651 is an equidigital number, since it uses as much as digits as its factorization.

6621233651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 35.

The square root of 6621233651 is about 81370.9631932669. The cubic root of 6621233651 is about 1877.7868981190.

The spelling of 6621233651 in words is "six billion, six hundred twenty-one million, two hundred thirty-three thousand, six hundred fifty-one".