1640125066 has 12 divisors (see below), whose sum is σ = 2513652498. Its totient is φ = 802612232.

The previous prime is 1640125061. The next prime is 1640125111. The reversal of 1640125066 is 6605210461.

It can be written as a sum of positive squares in only one way, i.e., 1614834225 + 25290841 = 40185^2 + 5029^2 .

It is not an unprimeable number, because it can be changed into a prime (1640125061) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 181201 + ... + 190036.

Almost surely, 2^1640125066 is an apocalyptic number.

1640125066 is a deficient number, since it is larger than the sum of its proper divisors (873527432).

1640125066 is an equidigital number, since it uses as much as digits as its factorization.

1640125066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371333 (or 371286 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 1640125066 is about 40498.4575755670. The cubic root of 1640125066 is about 1179.3036842739.

The spelling of 1640125066 in words is "one billion, six hundred forty million, one hundred twenty-five thousand, sixty-six".