8420641761 has 16 divisors (see below), whose sum is σ = 13007229824. Its totient is φ = 4745879424.

The previous prime is 8420641699. The next prime is 8420641771. The reversal of 8420641761 is 1671460248.

It is not a de Polignac number, because 8420641761 - 2⁹ = 8420641249 is a prime.

It is a super-2 number, since 2×8420641761² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8420641771) 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, 2744926 + ... + 2747991.

It is an arithmetic number, because the mean of its divisors is an integer number (812951864).

Almost surely, 2^8420641761 is an apocalyptic number.

It is an amenable number.

8420641761 is a deficient number, since it is larger than the sum of its proper divisors (4586588063).

8420641761 is a wasteful number, since it uses less digits than its factorization.

8420641761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5493000.

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 8420641761 is about 91764.0548417516. The cubic root of 8420641761 is about 2034.4564476649.

The spelling of 8420641761 in words is "eight billion, four hundred twenty million, six hundred forty-one thousand, seven hundred sixty-one".