645606274732 has 24 divisors (see below), whose sum is σ = 1161700604064. Its totient is φ = 313712180352.

The previous prime is 645606274711. The next prime is 645606274771. The reversal of 645606274732 is 237472606546.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 645606274732.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2418208 + ... + 2671879.

It is an arithmetic number, because the mean of its divisors is an integer number (48404191836).

Almost surely, 2^645606274732 is an apocalyptic number.

It is an amenable number.

645606274732 is a deficient number, since it is larger than the sum of its proper divisors (516094329332).

645606274732 is a wasteful number, since it uses less digits than its factorization.

645606274732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5090985 (or 5090983 counting only the distinct ones).

The product of its (nonzero) digits is 10160640, while the sum is 52.

The spelling of 645606274732 in words is "six hundred forty-five billion, six hundred six million, two hundred seventy-four thousand, seven hundred thirty-two".