646276721434 has 16 divisors (see below), whose sum is σ = 1022205484800. Its totient is φ = 305600511744.

The previous prime is 646276721371. The next prime is 646276721459. The reversal of 646276721434 is 434127672646.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14715754 + ... + 14759605.

It is an arithmetic number, because the mean of its divisors is an integer number (63887842800).

Almost surely, 2^646276721434 is an apocalyptic number.

646276721434 is a deficient number, since it is larger than the sum of its proper divisors (375928763366).

646276721434 is a wasteful number, since it uses less digits than its factorization.

646276721434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29475957.

The product of its digits is 8128512, while the sum is 52.

The spelling of 646276721434 in words is "six hundred forty-six billion, two hundred seventy-six million, seven hundred twenty-one thousand, four hundred thirty-four".