645447615334 has 4 divisors (see below), whose sum is σ = 968171423004. Its totient is φ = 322723807666.

The previous prime is 645447615317. The next prime is 645447615391. The reversal of 645447615334 is 433516744546.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 433516744546 = 2 ⋅216758372273.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 161361903832 + ... + 161361903835.

It is an arithmetic number, because the mean of its divisors is an integer number (242042855751).

Almost surely, 2^645447615334 is an apocalyptic number.

645447615334 is a deficient number, since it is larger than the sum of its proper divisors (322723807670).

645447615334 is a wasteful number, since it uses less digits than its factorization.

645447615334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322723807669.

The product of its digits is 14515200, while the sum is 52.

The spelling of 645447615334 in words is "six hundred forty-five billion, four hundred forty-seven million, six hundred fifteen thousand, three hundred thirty-four".