1640068007 has 4 divisors (see below), whose sum is σ = 1642603536. Its totient is φ = 1637532480.

The previous prime is 1640067977. The next prime is 1640068037. The reversal of 1640068007 is 7008600461.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1640067977) and next prime (1640068037).

It is a cyclic number.

It is not a de Polignac number, because 1640068007 - 2²² = 1635873703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640068037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1266794 + ... + 1268087.

It is an arithmetic number, because the mean of its divisors is an integer number (410650884).

Almost surely, 2^1640068007 is an apocalyptic number.

1640068007 is a deficient number, since it is larger than the sum of its proper divisors (2535529).

1640068007 is an equidigital number, since it uses as much as digits as its factorization.

1640068007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2535528.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 1640068007 is about 40497.7531105122. The cubic root of 1640068007 is about 1179.2900083515.

Adding to 1640068007 its reverse (7008600461), we get a palindrome (8648668468).

The spelling of 1640068007 in words is "one billion, six hundred forty million, sixty-eight thousand, seven".