1680455943 has 16 divisors (see below), whose sum is σ = 2512408800. Its totient is φ = 1110024000.

The previous prime is 1680455939. The next prime is 1680455951. The reversal of 1680455943 is 3495540861.

1680455943 is a `hidden beast` number, since 16 + 8 + 0 + 45 + 594 + 3 = 666.

It is not a de Polignac number, because 1680455943 - 2² = 1680455939 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680455963) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 282558 + ... + 288443.

It is an arithmetic number, because the mean of its divisors is an integer number (157025550).

Almost surely, 2^1680455943 is an apocalyptic number.

1680455943 is a deficient number, since it is larger than the sum of its proper divisors (831952857).

1680455943 is a wasteful number, since it uses less digits than its factorization.

1680455943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571119 (or 571113 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The square root of 1680455943 is about 40993.3646216068. The cubic root of 1680455943 is about 1188.8919240636.

The spelling of 1680455943 in words is "one billion, six hundred eighty million, four hundred fifty-five thousand, nine hundred forty-three".