645067144722 has 128 divisors (see below), whose sum is σ = 1737205843968. Its totient is φ = 154215244800.

The previous prime is 645067144721. The next prime is 645067144723. The reversal of 645067144722 is 227441760546.

It is an interprime number because it is at equal distance from previous prime (645067144721) and next prime (645067144723).

It is a super-2 number, since 2×645067144722² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645067144721) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1929322 + ... + 2238842.

It is an arithmetic number, because the mean of its divisors is an integer number (13571920656).

Almost surely, 2^645067144722 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645067144722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (868602921984).

645067144722 is an abundant number, since it is smaller than the sum of its proper divisors (1092138699246).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645067144722 is a wasteful number, since it uses less digits than its factorization.

645067144722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309904.

The product of its (nonzero) digits is 2257920, while the sum is 48.

The spelling of 645067144722 in words is "six hundred forty-five billion, sixty-seven million, one hundred forty-four thousand, seven hundred twenty-two".