6440122564 has 6 divisors (see below), whose sum is σ = 11270214494. Its totient is φ = 3220061280.

The previous prime is 6440122547. The next prime is 6440122583. The reversal of 6440122564 is 4652210446.

It can be written as a sum of positive squares in only one way, i.e., 4045977664 + 2394144900 = 63608^2 + 48930^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 805015317 + ... + 805015324.

Almost surely, 2^6440122564 is an apocalyptic number.

It is an amenable number.

6440122564 is a deficient number, since it is larger than the sum of its proper divisors (4830091930).

6440122564 is a wasteful number, since it uses less digits than its factorization.

6440122564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1610030645 (or 1610030643 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 34.

The square root of 6440122564 is about 80250.3742296570. The cubic root of 6440122564 is about 1860.5072963983.

The spelling of 6440122564 in words is "six billion, four hundred forty million, one hundred twenty-two thousand, five hundred sixty-four".