6420065771 has 4 divisors (see below), whose sum is σ = 7337218032. Its totient is φ = 5502913512.

The previous prime is 6420065753. The next prime is 6420065777. The reversal of 6420065771 is 1775600246.

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

It is a cyclic number.

It is not a de Polignac number, because 6420065771 - 2¹⁸ = 6419803627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6420065777) 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, 458576120 + ... + 458576133.

It is an arithmetic number, because the mean of its divisors is an integer number (1834304508).

Almost surely, 2^6420065771 is an apocalyptic number.

6420065771 is a deficient number, since it is larger than the sum of its proper divisors (917152261).

6420065771 is an equidigital number, since it uses as much as digits as its factorization.

6420065771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917152260.

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 6420065771 is about 80125.3129229459. The cubic root of 6420065771 is about 1858.5738645073.

The spelling of 6420065771 in words is "six billion, four hundred twenty million, sixty-five thousand, seven hundred seventy-one".