1666964724 has 24 divisors (see below), whose sum is σ = 3909954048. Its totient is φ = 552744960.

The previous prime is 1666964723. The next prime is 1666964731. The reversal of 1666964724 is 4274696661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666964723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 361357 + ... + 365940.

It is an arithmetic number, because the mean of its divisors is an integer number (162914752).

Almost surely, 2^1666964724 is an apocalyptic number.

It is an amenable number.

1666964724 is an abundant number, since it is smaller than the sum of its proper divisors (2242989324).

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

1666964724 is a wasteful number, since it uses less digits than its factorization.

1666964724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 727495 (or 727493 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 51.

The square root of 1666964724 is about 40828.4793250986. The cubic root of 1666964724 is about 1185.7017744928.

The spelling of 1666964724 in words is "one billion, six hundred sixty-six million, nine hundred sixty-four thousand, seven hundred twenty-four".