6642606277 has 4 divisors (see below), whose sum is σ = 6648065676. Its totient is φ = 6637146880.

The previous prime is 6642606253. The next prime is 6642606301. The reversal of 6642606277 is 7726062466.

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

It is an interprime number because it is at equal distance from previous prime (6642606253) and next prime (6642606301).

It can be written as a sum of positive squares in 2 ways, for example, as 2342656801 + 4299949476 = 48401^2 + 65574^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6642606277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6642606247) 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, 2727874 + ... + 2730307.

It is an arithmetic number, because the mean of its divisors is an integer number (1662016419).

Almost surely, 2^6642606277 is an apocalyptic number.

It is an amenable number.

6642606277 is a deficient number, since it is larger than the sum of its proper divisors (5459399).

6642606277 is a wasteful number, since it uses less digits than its factorization.

6642606277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5459398.

The product of its (nonzero) digits is 1016064, while the sum is 46.

The square root of 6642606277 is about 81502.1857191573. The cubic root of 6642606277 is about 1879.8051590931.

The spelling of 6642606277 in words is "six billion, six hundred forty-two million, six hundred six thousand, two hundred seventy-seven".