1665620308964 has 12 divisors (see below), whose sum is σ = 2919559751724. Its totient is φ = 831460379904.

The previous prime is 1665620308951. The next prime is 1665620309011. The reversal of 1665620308964 is 4698030265661.

It can be written as a sum of positive squares in 2 ways, for example, as 221878681600 + 1443741627364 = 471040^2 + 1201558^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 337440869 + ... + 337445804.

It is an arithmetic number, because the mean of its divisors is an integer number (243296645977).

Almost surely, 2^{1665620308964} is an apocalyptic number.

It is an amenable number.

1665620308964 is a deficient number, since it is larger than the sum of its proper divisors (1253939442760).

1665620308964 is a wasteful number, since it uses less digits than its factorization.

1665620308964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 674887294 (or 674887292 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 56.

The spelling of 1665620308964 in words is "one trillion, six hundred sixty-five billion, six hundred twenty million, three hundred eight thousand, nine hundred sixty-four".