645406201266244 has 24 divisors (see below), whose sum is σ = 1258354837289088. Its totient is φ = 287124615649440.

The previous prime is 645406201266241. The next prime is 645406201266319. The reversal of 645406201266244 is 442662102604546.

It is a junction number, because it is equal to n+sod(n) for n = 645406201266191 and 645406201266200.

It is not an unprimeable number, because it can be changed into a prime (645406201266241) 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, 156045984699 + ... + 156045988834.

It is an arithmetic number, because the mean of its divisors is an integer number (52431451553712).

Almost surely, 2^{645406201266244} is an apocalyptic number.

It is an amenable number.

645406201266244 is a deficient number, since it is larger than the sum of its proper divisors (612948636022844).

645406201266244 is a wasteful number, since it uses less digits than its factorization.

645406201266244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312091973595 (or 312091973593 counting only the distinct ones).

The product of its (nonzero) digits is 13271040, while the sum is 52.

The spelling of 645406201266244 in words is "six hundred forty-five trillion, four hundred six billion, two hundred one million, two hundred sixty-six thousand, two hundred forty-four".