1640379166645 has 16 divisors (see below), whose sum is σ = 1975572478080. Its totient is φ = 1307559109824.

The previous prime is 1640379166637. The next prime is 1640379166649. The reversal of 1640379166645 is 5466619730461.

It is a cyclic number.

It is not a de Polignac number, because 1640379166645 - 2³ = 1640379166637 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1640379166645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640379166649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20320152 + ... + 20400718.

It is an arithmetic number, because the mean of its divisors is an integer number (123473279880).

Almost surely, 2^{1640379166645} is an apocalyptic number.

It is an amenable number.

1640379166645 is a deficient number, since it is larger than the sum of its proper divisors (335193311435).

1640379166645 is a wasteful number, since it uses less digits than its factorization.

1640379166645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95244.

The product of its (nonzero) digits is 19595520, while the sum is 58.

The spelling of 1640379166645 in words is "one trillion, six hundred forty billion, three hundred seventy-nine million, one hundred sixty-six thousand, six hundred forty-five".