1640918995 has 8 divisors (see below), whose sum is σ = 1974589920. Its totient is φ = 1309077120.

The previous prime is 1640918987. The next prime is 1640919011. The reversal of 1640918995 is 5998190461.

It is a happy number.

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

It is not a de Polignac number, because 1640918995 - 2³ = 1640918987 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 455286 + ... + 458875.

It is an arithmetic number, because the mean of its divisors is an integer number (246823740).

Almost surely, 2^1640918995 is an apocalyptic number.

1640918995 is a deficient number, since it is larger than the sum of its proper divisors (333670925).

1640918995 is an equidigital number, since it uses as much as digits as its factorization.

1640918995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 914525.

The product of its (nonzero) digits is 699840, while the sum is 52.

The square root of 1640918995 is about 40508.2583555502. The cubic root of 1640918995 is about 1179.4939405701.

The spelling of 1640918995 in words is "one billion, six hundred forty million, nine hundred eighteen thousand, nine hundred ninety-five".