1680445542 has 32 divisors (see below), whose sum is σ = 3500172000. Its totient is φ = 537195008.

The previous prime is 1680445517. The next prime is 1680445549. The reversal of 1680445542 is 2455440861.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1680445542.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680445549) 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, 6483 + ... + 58334.

It is an arithmetic number, because the mean of its divisors is an integer number (109380375).

Almost surely, 2^1680445542 is an apocalyptic number.

1680445542 is an abundant number, since it is smaller than the sum of its proper divisors (1819726458).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1680445542 is a wasteful number, since it uses less digits than its factorization.

1680445542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65000.

The product of its (nonzero) digits is 153600, while the sum is 39.

The square root of 1680445542 is about 40993.2377594159. The cubic root of 1680445542 is about 1188.8894712193.

The spelling of 1680445542 in words is "one billion, six hundred eighty million, four hundred forty-five thousand, five hundred forty-two".