644076211022 has 16 divisors (see below), whose sum is σ = 1000196920800. Its totient is φ = 310694311200.

The previous prime is 644076211019. The next prime is 644076211043. The reversal of 644076211022 is 220112670446.

It is a happy number.

It is a congruent number.

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, 4192322 + ... + 4343237.

It is an arithmetic number, because the mean of its divisors is an integer number (62512307550).

Almost surely, 2^644076211022 is an apocalyptic number.

644076211022 is a deficient number, since it is larger than the sum of its proper divisors (356120709778).

644076211022 is a wasteful number, since it uses less digits than its factorization.

644076211022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8536891.

The product of its (nonzero) digits is 32256, while the sum is 35.

Adding to 644076211022 its reverse (220112670446), we get a palindrome (864188881468).

The spelling of 644076211022 in words is "six hundred forty-four billion, seventy-six million, two hundred eleven thousand, twenty-two".