1640748827 has 2 divisors, whose sum is σ = 1640748828. Its totient is φ = 1640748826.

The previous prime is 1640748797. The next prime is 1640748833. The reversal of 1640748827 is 7288470461.

It is a strong prime.

It is an emirp because it is prime and its reverse (7288470461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1640748827 - 2¹² = 1640744731 is a prime.

It is not a weakly prime, because it can be changed into another prime (1640742827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820374413 + 820374414.

It is an arithmetic number, because the mean of its divisors is an integer number (820374414).

Almost surely, 2^1640748827 is an apocalyptic number.

1640748827 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640748827 is an equidigital number, since it uses as much as digits as its factorization.

1640748827 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 602112, while the sum is 47.

The square root of 1640748827 is about 40506.1578898814. The cubic root of 1640748827 is about 1179.4531668605.

The spelling of 1640748827 in words is "one billion, six hundred forty million, seven hundred forty-eight thousand, eight hundred twenty-seven".