644576451292 has 6 divisors (see below), whose sum is σ = 1128008789768. Its totient is φ = 322288225644.

The previous prime is 644576451269. The next prime is 644576451313. The reversal of 644576451292 is 292154675446.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80572056408 + ... + 80572056415.

Almost surely, 2^644576451292 is an apocalyptic number.

It is an amenable number.

644576451292 is a deficient number, since it is larger than the sum of its proper divisors (483432338476).

644576451292 is a wasteful number, since it uses less digits than its factorization.

644576451292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161144112827 (or 161144112825 counting only the distinct ones).

The product of its digits is 14515200, while the sum is 55.

The spelling of 644576451292 in words is "six hundred forty-four billion, five hundred seventy-six million, four hundred fifty-one thousand, two hundred ninety-two".