6420362561 has 4 divisors (see below), whose sum is σ = 6758276400. Its totient is φ = 6082448724.

The previous prime is 6420362521. The next prime is 6420362563. The reversal of 6420362561 is 1652630246.

It is a happy number.

6420362561 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1652630246 = 2 ⋅826315123.

It is a cyclic number.

It is not a de Polignac number, because 6420362561 - 2³⁰ = 5346620737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6420362563) 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, 168956891 + ... + 168956928.

It is an arithmetic number, because the mean of its divisors is an integer number (1689569100).

Almost surely, 2^6420362561 is an apocalyptic number.

It is an amenable number.

6420362561 is a deficient number, since it is larger than the sum of its proper divisors (337913839).

6420362561 is a wasteful number, since it uses less digits than its factorization.

6420362561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337913838.

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 6420362561 is about 80127.1649379909. The cubic root of 6420362561 is about 1858.6025037589.

The spelling of 6420362561 in words is "six billion, four hundred twenty million, three hundred sixty-two thousand, five hundred sixty-one".