6620012779 has 2 divisors, whose sum is σ = 6620012780. Its totient is φ = 6620012778.

The previous prime is 6620012767. The next prime is 6620012809. The reversal of 6620012779 is 9772100266.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6620012779 - 2²¹ = 6617915627 is a prime.

It is not a weakly prime, because it can be changed into another prime (6620012759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3310006389 + 3310006390.

It is an arithmetic number, because the mean of its divisors is an integer number (3310006390).

Almost surely, 2^6620012779 is an apocalyptic number.

6620012779 is a deficient number, since it is larger than the sum of its proper divisors (1).

6620012779 is an equidigital number, since it uses as much as digits as its factorization.

6620012779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 6620012779 is about 81363.4609576068. The cubic root of 6620012779 is about 1877.6714776155.

The spelling of 6620012779 in words is "six billion, six hundred twenty million, twelve thousand, seven hundred seventy-nine".