645274375103 has 4 divisors (see below), whose sum is σ = 645277362048. Its totient is φ = 645271388160.

The previous prime is 645274375069. The next prime is 645274375133. The reversal of 645274375103 is 301573472546.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 301573472546 = 2 ⋅150786736273.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645274375103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645274375133) 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, 1141826 + ... + 1610687.

It is an arithmetic number, because the mean of its divisors is an integer number (161319340512).

Almost surely, 2^645274375103 is an apocalyptic number.

645274375103 is a deficient number, since it is larger than the sum of its proper divisors (2986945).

645274375103 is a wasteful number, since it uses less digits than its factorization.

645274375103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2986944.

The product of its (nonzero) digits is 2116800, while the sum is 47.

The spelling of 645274375103 in words is "six hundred forty-five billion, two hundred seventy-four million, three hundred seventy-five thousand, one hundred three".