1640516727 has 4 divisors (see below), whose sum is σ = 2187355640. Its totient is φ = 1093677816.

The previous prime is 1640516719. The next prime is 1640516777. The reversal of 1640516727 is 7276150461.

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

It is not a de Polignac number, because 1640516727 - 2³ = 1640516719 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 (1640516777) 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, 273419452 + ... + 273419457.

It is an arithmetic number, because the mean of its divisors is an integer number (546838910).

Almost surely, 2^1640516727 is an apocalyptic number.

1640516727 is a deficient number, since it is larger than the sum of its proper divisors (546838913).

1640516727 is an equidigital number, since it uses as much as digits as its factorization.

1640516727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546838912.

The product of its (nonzero) digits is 70560, while the sum is 39.

The square root of 1640516727 is about 40503.2927920682. The cubic root of 1640516727 is about 1179.3975491684.

The spelling of 1640516727 in words is "one billion, six hundred forty million, five hundred sixteen thousand, seven hundred twenty-seven".