1664723410775 has 48 divisors (see below), whose sum is σ = 2164569824736. Its totient is φ = 1268878840320.

The previous prime is 1664723410771. The next prime is 1664723410781. The reversal of 1664723410775 is 5770143274661.

It is a happy number.

It is not a de Polignac number, because 1664723410775 - 2² = 1664723410771 is a prime.

It is a super-2 number, since 2×1664723410775² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664723410771) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9772229 + ... + 9941121.

It is an arithmetic number, because the mean of its divisors is an integer number (45095204682).

Almost surely, 2^{1664723410775} is an apocalyptic number.

1664723410775 is a deficient number, since it is larger than the sum of its proper divisors (499846413961).

1664723410775 is a wasteful number, since it uses less digits than its factorization.

1664723410775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169172 (or 169167 counting only the distinct ones).

The product of its (nonzero) digits is 5927040, while the sum is 53.

The spelling of 1664723410775 in words is "one trillion, six hundred sixty-four billion, seven hundred twenty-three million, four hundred ten thousand, seven hundred seventy-five".