6642020427 has 16 divisors (see below), whose sum is σ = 10234897920. Its totient is φ = 3752793792.

The previous prime is 6642020383. The next prime is 6642020443. The reversal of 6642020427 is 7240202466.

It is not a de Polignac number, because 6642020427 - 2⁷ = 6642020299 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6642020447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1775023 + ... + 1778760.

It is an arithmetic number, because the mean of its divisors is an integer number (639681120).

Almost surely, 2^6642020427 is an apocalyptic number.

6642020427 is a deficient number, since it is larger than the sum of its proper divisors (3592877493).

6642020427 is a wasteful number, since it uses less digits than its factorization.

6642020427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3553882.

The product of its (nonzero) digits is 32256, while the sum is 33.

The square root of 6642020427 is about 81498.5915645172. The cubic root of 6642020427 is about 1879.7498938260.

The spelling of 6642020427 in words is "six billion, six hundred forty-two million, twenty thousand, four hundred twenty-seven".