6620615158 has 4 divisors (see below), whose sum is σ = 9930922740. Its totient is φ = 3310307578.

The previous prime is 6620615149. The next prime is 6620615219. The reversal of 6620615158 is 8515160266.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 6620615158.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1655153788 + ... + 1655153791.

It is an arithmetic number, because the mean of its divisors is an integer number (2482730685).

Almost surely, 2^6620615158 is an apocalyptic number.

6620615158 is a deficient number, since it is larger than the sum of its proper divisors (3310307582).

6620615158 is a wasteful number, since it uses less digits than its factorization.

6620615158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3310307581.

The product of its (nonzero) digits is 86400, while the sum is 40.

The square root of 6620615158 is about 81367.1626517725. The cubic root of 6620615158 is about 1877.7284279366.

The spelling of 6620615158 in words is "six billion, six hundred twenty million, six hundred fifteen thousand, one hundred fifty-eight".