6420271761 has 16 divisors (see below), whose sum is σ = 9519001600. Its totient is φ = 4276811664.

The previous prime is 6420271733. The next prime is 6420271763. The reversal of 6420271761 is 1671720246.

6420271761 is a `hidden beast` number, since 642 + 0 + 2 + 7 + 1 + 7 + 6 + 1 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-6420271761 is a prime.

It is a super-2 number, since 2×6420271761² = 82439778970188082242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6420271763) 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, 58426 + ... + 127491.

It is an arithmetic number, because the mean of its divisors is an integer number (594937600).

Almost surely, 2^6420271761 is an apocalyptic number.

It is an amenable number.

6420271761 is a deficient number, since it is larger than the sum of its proper divisors (3098729839).

6420271761 is a wasteful number, since it uses less digits than its factorization.

6420271761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187205 (or 187199 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 6420271761 is about 80126.5983366323. The cubic root of 6420271761 is about 1858.5937419535.

The spelling of 6420271761 in words is "six billion, four hundred twenty million, two hundred seventy-one thousand, seven hundred sixty-one".