7946662621 has 4 divisors (see below), whose sum is σ = 8220685500. Its totient is φ = 7672639744.

The previous prime is 7946662613. The next prime is 7946662639. The reversal of 7946662621 is 1262666497.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6398240121 + 1548422500 = 79989^2 + 39350^2 .

It is a cyclic number.

It is not a de Polignac number, because 7946662621 - 2³ = 7946662613 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7946642621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137011396 + ... + 137011453.

It is an arithmetic number, because the mean of its divisors is an integer number (2055171375).

Almost surely, 2^7946662621 is an apocalyptic number.

It is an amenable number.

7946662621 is a deficient number, since it is larger than the sum of its proper divisors (274022879).

7946662621 is a wasteful number, since it uses less digits than its factorization.

7946662621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274022878.

The product of its digits is 1306368, while the sum is 49.

The square root of 7946662621 is about 89144.0554439835. The cubic root of 7946662621 is about 1995.5453036235.

The spelling of 7946662621 in words is "seven billion, nine hundred forty-six million, six hundred sixty-two thousand, six hundred twenty-one".