6620640455 has 32 divisors (see below), whose sum is σ = 9491973120. Its totient is φ = 4369265280.

The previous prime is 6620640409. The next prime is 6620640461. The reversal of 6620640455 is 5540460266.

It is not a de Polignac number, because 6620640455 - 2⁶ = 6620640391 is a prime.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 36287 + ... + 120656.

It is an arithmetic number, because the mean of its divisors is an integer number (296624160).

Almost surely, 2^6620640455 is an apocalyptic number.

6620640455 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

6620640455 is a deficient number, since it is larger than the sum of its proper divisors (2871332665).

6620640455 is a wasteful number, since it uses less digits than its factorization.

6620640455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157031.

The product of its (nonzero) digits is 172800, while the sum is 38.

The square root of 6620640455 is about 81367.3181013114. The cubic root of 6620640455 is about 1877.7308194987.

The spelling of 6620640455 in words is "six billion, six hundred twenty million, six hundred forty thousand, four hundred fifty-five".