645794849475 has 36 divisors (see below), whose sum is σ = 1157660375976. Its totient is φ = 344135072640.

The previous prime is 645794849461. The next prime is 645794849503. The reversal of 645794849475 is 574948497546.

645794849475 is a `hidden beast` number, since 6 + 4 + 5 + 79 + 4 + 84 + 9 + 475 = 666.

It is not a de Polignac number, because 645794849475 - 2¹² = 645794845379 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 934509 + ... + 1471358.

It is an arithmetic number, because the mean of its divisors is an integer number (32157232666).

Almost surely, 2^645794849475 is an apocalyptic number.

645794849475 is a deficient number, since it is larger than the sum of its proper divisors (511865526501).

645794849475 is a wasteful number, since it uses less digits than its factorization.

645794849475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2407076 (or 2407068 counting only the distinct ones).

The product of its digits is 1219276800, while the sum is 72.

The spelling of 645794849475 in words is "six hundred forty-five billion, seven hundred ninety-four million, eight hundred forty-nine thousand, four hundred seventy-five".