1640121607 has 8 divisors (see below), whose sum is σ = 1705774400. Its totient is φ = 1575591264.

The previous prime is 1640121601. The next prime is 1640121617. The reversal of 1640121607 is 7061210461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1640121607 - 2⁷ = 1640121479 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 (1640121601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 277632 + ... + 283477.

It is an arithmetic number, because the mean of its divisors is an integer number (213221800).

Almost surely, 2^1640121607 is an apocalyptic number.

1640121607 is a deficient number, since it is larger than the sum of its proper divisors (65652793).

1640121607 is an equidigital number, since it uses as much as digits as its factorization.

1640121607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561225.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 1640121607 is about 40498.4148702144. The cubic root of 1640121607 is about 1179.3028552285.

The spelling of 1640121607 in words is "one billion, six hundred forty million, one hundred twenty-one thousand, six hundred seven".