1640506607866 has 32 divisors (see below), whose sum is σ = 3046975747200. Its totient is φ = 646328180736.

The previous prime is 1640506607833. The next prime is 1640506607867. The reversal of 1640506607866 is 6687066050461.

It is not an unprimeable number, because it can be changed into a prime (1640506607867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80139591 + ... + 80160058.

It is an arithmetic number, because the mean of its divisors is an integer number (95217992100).

Almost surely, 2^{1640506607866} is an apocalyptic number.

1640506607866 is a deficient number, since it is larger than the sum of its proper divisors (1406469139334).

1640506607866 is a wasteful number, since it uses less digits than its factorization.

1640506607866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160299718.

The product of its (nonzero) digits is 8709120, while the sum is 55.

The spelling of 1640506607866 in words is "one trillion, six hundred forty billion, five hundred six million, six hundred seven thousand, eight hundred sixty-six".