1665064737253 has 16 divisors (see below), whose sum is σ = 1744814494080. Its totient is φ = 1585934050624.

The previous prime is 1665064737229. The next prime is 1665064737263. The reversal of 1665064737253 is 3527374605661.

It is a cyclic number.

It is not a de Polignac number, because 1665064737253 - 2³⁷ = 1527625783781 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1665064737194 and 1665064737203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665064737263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12138750 + ... + 12275152.

It is an arithmetic number, because the mean of its divisors is an integer number (109050905880).

Almost surely, 2^{1665064737253} is an apocalyptic number.

It is an amenable number.

1665064737253 is a deficient number, since it is larger than the sum of its proper divisors (79749756827).

1665064737253 is a wasteful number, since it uses less digits than its factorization.

1665064737253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138668.

The product of its (nonzero) digits is 19051200, while the sum is 55.

The spelling of 1665064737253 in words is "one trillion, six hundred sixty-five billion, sixty-four million, seven hundred thirty-seven thousand, two hundred fifty-three".