1640712767 has 2 divisors, whose sum is σ = 1640712768. Its totient is φ = 1640712766.

The previous prime is 1640712743. The next prime is 1640712779. The reversal of 1640712767 is 7672170461.

It is a strong prime.

It is an emirp because it is prime and its reverse (7672170461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1640712767 - 2⁸ = 1640712511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1640712737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820356383 + 820356384.

It is an arithmetic number, because the mean of its divisors is an integer number (820356384).

Almost surely, 2^1640712767 is an apocalyptic number.

1640712767 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640712767 is an equidigital number, since it uses as much as digits as its factorization.

1640712767 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 98784, while the sum is 41.

The square root of 1640712767 is about 40505.7127699291. The cubic root of 1640712767 is about 1179.4445262138. Note that the first 3 decimals are identical.

The spelling of 1640712767 in words is "one billion, six hundred forty million, seven hundred twelve thousand, seven hundred sixty-seven".