1666579402 has 8 divisors (see below), whose sum is σ = 2608559136. Its totient is φ = 797059692.

The previous prime is 1666579399. The next prime is 1666579403. The reversal of 1666579402 is 2049756661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (46), and also a Moran number because the ratio is a prime number: 36229987 = 1666579402 / (1 + 6 + 6 + 6 + 5 + 7 + 9 + 4 + 0 + 2).

It is not an unprimeable number, because it can be changed into a prime (1666579403) 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 3 ways as a sum of consecutive naturals, for example, 18114948 + ... + 18115039.

It is an arithmetic number, because the mean of its divisors is an integer number (326069892).

Almost surely, 2^1666579402 is an apocalyptic number.

1666579402 is a deficient number, since it is larger than the sum of its proper divisors (941979734).

1666579402 is a wasteful number, since it uses less digits than its factorization.

1666579402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36230012.

The product of its (nonzero) digits is 544320, while the sum is 46.

The square root of 1666579402 is about 40823.7602628665. The cubic root of 1666579402 is about 1185.6104083950.

The spelling of 1666579402 in words is "one billion, six hundred sixty-six million, five hundred seventy-nine thousand, four hundred two".