1640142673 has 8 divisors (see below), whose sum is σ = 1843103808. Its totient is φ = 1448152464.

The previous prime is 1640142661. The next prime is 1640142701. The reversal of 1640142673 is 3762410461.

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 1640142673 - 2²⁵ = 1606588241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1640142613) 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, 2742415 + ... + 2743012.

It is an arithmetic number, because the mean of its divisors is an integer number (230387976).

Almost surely, 2^1640142673 is an apocalyptic number.

1640142673 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1640142673 is a deficient number, since it is larger than the sum of its proper divisors (202961135).

1640142673 is a wasteful number, since it uses less digits than its factorization.

1640142673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5485463.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 1640142673 is about 40498.6749536327. The cubic root of 1640142673 is about 1179.3079042622.

The spelling of 1640142673 in words is "one billion, six hundred forty million, one hundred forty-two thousand, six hundred seventy-three".