1640663455 has 8 divisors (see below), whose sum is σ = 2084607792. Its totient is φ = 1235323008.

The previous prime is 1640663447. The next prime is 1640663467. The reversal of 1640663455 is 5543660461.

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 1640663455 - 2³ = 1640663447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9650877 + ... + 9651046.

It is an arithmetic number, because the mean of its divisors is an integer number (260575974).

Almost surely, 2^1640663455 is an apocalyptic number.

1640663455 is a deficient number, since it is larger than the sum of its proper divisors (443944337).

1640663455 is a wasteful number, since it uses less digits than its factorization.

1640663455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19301945.

The product of its (nonzero) digits is 259200, while the sum is 40.

The square root of 1640663455 is about 40505.1040610933. The cubic root of 1640663455 is about 1179.4327099365.

The spelling of 1640663455 in words is "one billion, six hundred forty million, six hundred sixty-three thousand, four hundred fifty-five".