644545415005033 has 16 divisors (see below), whose sum is σ = 692012538112896. Its totient is φ = 598857003803520.

The previous prime is 644545415004989. The next prime is 644545415005099. The reversal of 644545415005033 is 330500514545446.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-644545415005033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (644545515005033) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1800136660 + ... + 1800494677.

It is an arithmetic number, because the mean of its divisors is an integer number (43250783632056).

Almost surely, 2^{644545415005033} is an apocalyptic number.

It is an amenable number.

644545415005033 is a deficient number, since it is larger than the sum of its proper divisors (47467123107863).

644545415005033 is a wasteful number, since it uses less digits than its factorization.

644545415005033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3600631584.

The product of its (nonzero) digits is 8640000, while the sum is 49.

The spelling of 644545415005033 in words is "six hundred forty-four trillion, five hundred forty-five billion, four hundred fifteen million, five thousand, thirty-three".