1661380824 has 64 divisors (see below), whose sum is σ = 4454611200. Its totient is φ = 514740096.

The previous prime is 1661380813. The next prime is 1661380829. The reversal of 1661380824 is 4280831661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661380829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10204 + ... + 58539.

It is an arithmetic number, because the mean of its divisors is an integer number (69603300).

Almost surely, 2^1661380824 is an apocalyptic number.

It is an amenable number.

1661380824 is an abundant number, since it is smaller than the sum of its proper divisors (2793230376).

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

1661380824 is a wasteful number, since it uses less digits than its factorization.

1661380824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68824 (or 68820 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 1661380824 is about 40760.0395485578. The cubic root of 1661380824 is about 1184.3763621968.

The spelling of 1661380824 in words is "one billion, six hundred sixty-one million, three hundred eighty thousand, eight hundred twenty-four".