1666931040 has 72 divisors (see below), whose sum is σ = 5688407088. Its totient is φ = 444514560.

The previous prime is 1666931023. The next prime is 1666931051. The reversal of 1666931040 is 401396661.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1666930986 and 1666931004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 577356 + ... + 580235.

It is an arithmetic number, because the mean of its divisors is an integer number (79005654).

Almost surely, 2^1666931040 is an apocalyptic number.

1666931040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1666931040 is an abundant number, since it is smaller than the sum of its proper divisors (4021476048).

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

1666931040 is a wasteful number, since it uses less digits than its factorization.

1666931040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1157612 (or 1157601 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 1666931040 is about 40828.0668168357. The cubic root of 1666931040 is about 1185.6937880316.

The spelling of 1666931040 in words is "one billion, six hundred sixty-six million, nine hundred thirty-one thousand, forty".