645704260051 has 8 divisors (see below), whose sum is σ = 649852405200. Its totient is φ = 641562124800.

The previous prime is 645704260039. The next prime is 645704260057. The reversal of 645704260051 is 150062407546.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645704260051 - 2¹³ = 645704251859 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645704259986 and 645704260013.

It is not an unprimeable number, because it can be changed into a prime (645704260057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1286806 + ... + 1716763.

It is an arithmetic number, because the mean of its divisors is an integer number (81231550650).

Almost surely, 2^645704260051 is an apocalyptic number.

645704260051 is a deficient number, since it is larger than the sum of its proper divisors (4148145149).

645704260051 is a wasteful number, since it uses less digits than its factorization.

645704260051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3004949.

The product of its (nonzero) digits is 201600, while the sum is 40.

Adding to 645704260051 its reverse (150062407546), we get a palindrome (795766667597).

The spelling of 645704260051 in words is "six hundred forty-five billion, seven hundred four million, two hundred sixty thousand, fifty-one".