1664735860722 has 48 divisors (see below), whose sum is σ = 3858374948832. Its totient is φ = 474790970880.

The previous prime is 1664735860717. The next prime is 1664735860783. The reversal of 1664735860722 is 2270685374661.

It is a happy number.

It is a super-2 number, since 2×1664735860722² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43619803 + ... + 43657950.

It is an arithmetic number, because the mean of its divisors is an integer number (80382811434).

Almost surely, 2^{1664735860722} is an apocalyptic number.

1664735860722 is an abundant number, since it is smaller than the sum of its proper divisors (2193639088110).

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

1664735860722 is a wasteful number, since it uses less digits than its factorization.

1664735860722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87277803 (or 87277786 counting only the distinct ones).

The product of its (nonzero) digits is 20321280, while the sum is 57.

The spelling of 1664735860722 in words is "one trillion, six hundred sixty-four billion, seven hundred thirty-five million, eight hundred sixty thousand, seven hundred twenty-two".