8420745861 has 48 divisors (see below), whose sum is σ = 13518505728. Its totient is φ = 5050172160.

The previous prime is 8420745803. The next prime is 8420745911. The reversal of 8420745861 is 1685470248.

It is not a de Polignac number, because 8420745861 - 2⁶ = 8420745797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8420745461) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1158340 + ... + 1165586.

It is an arithmetic number, because the mean of its divisors is an integer number (281635536).

Almost surely, 2^8420745861 is an apocalyptic number.

It is an amenable number.

8420745861 is a deficient number, since it is larger than the sum of its proper divisors (5097759867).

8420745861 is a wasteful number, since it uses less digits than its factorization.

8420745861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7383 (or 7358 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 45.

The square root of 8420745861 is about 91764.6220555613. The cubic root of 8420745861 is about 2034.4648312715.

The spelling of 8420745861 in words is "eight billion, four hundred twenty million, seven hundred forty-five thousand, eight hundred sixty-one".