6620651 has 4 divisors (see below), whose sum is σ = 6686304. Its totient is φ = 6555000.

The previous prime is 6620629. The next prime is 6620681. The reversal of 6620651 is 1560266.

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 6620651 - 2⁶ = 6620587 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6620651.

It is not an unprimeable number, because it can be changed into a prime (6620611) 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, 32675 + ... + 32876.

It is an arithmetic number, because the mean of its divisors is an integer number (1671576).

Almost surely, 2^6620651 is an apocalyptic number.

6620651 is a deficient number, since it is larger than the sum of its proper divisors (65653).

6620651 is a wasteful number, since it uses less digits than its factorization.

6620651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65652.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 6620651 is about 2573.0625721113. The cubic root of 6620651 is about 187.7731816414.

The spelling of 6620651 in words is "six million, six hundred twenty thousand, six hundred fifty-one".