6620435651 has 4 divisors (see below), whose sum is σ = 6761296032. Its totient is φ = 6479575272.

The previous prime is 6620435629. The next prime is 6620435663. The reversal of 6620435651 is 1565340266.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 6620435651 - 2²² = 6616241347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6620435551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70430120 + ... + 70430213.

It is an arithmetic number, because the mean of its divisors is an integer number (1690324008).

Almost surely, 2^6620435651 is an apocalyptic number.

6620435651 is a deficient number, since it is larger than the sum of its proper divisors (140860381).

6620435651 is a wasteful number, since it uses less digits than its factorization.

6620435651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140860380.

The product of its (nonzero) digits is 129600, while the sum is 38.

The square root of 6620435651 is about 81366.0595764598. The cubic root of 6620435651 is about 1877.7114572859.

The spelling of 6620435651 in words is "six billion, six hundred twenty million, four hundred thirty-five thousand, six hundred fifty-one".