1640162899 has 8 divisors (see below), whose sum is σ = 1685248928. Its totient is φ = 1595116800.

The previous prime is 1640162891. The next prime is 1640162903. The reversal of 1640162899 is 9982610461.

It is a happy number.

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 1640162899 - 2³ = 1640162891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1640162891) 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, 85699 + ... + 103075.

It is an arithmetic number, because the mean of its divisors is an integer number (210656116).

Almost surely, 2^1640162899 is an apocalyptic number.

1640162899 is a deficient number, since it is larger than the sum of its proper divisors (45086029).

1640162899 is a wasteful number, since it uses less digits than its factorization.

1640162899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19965.

The product of its (nonzero) digits is 186624, while the sum is 46.

The square root of 1640162899 is about 40498.9246647365. The cubic root of 1640162899 is about 1179.3127519265.

The spelling of 1640162899 in words is "one billion, six hundred forty million, one hundred sixty-two thousand, eight hundred ninety-nine".