1666971495 has 112 divisors (see below), whose sum is σ = 3475215360. Its totient is φ = 751488192.

The previous prime is 1666971451. The next prime is 1666971503. The reversal of 1666971495 is 5941796661.

It is a happy number.

It is not a de Polignac number, because 1666971495 - 2¹² = 1666967399 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 2015272 + ... + 2016098.

Almost surely, 2^1666971495 is an apocalyptic number.

1666971495 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1666971495 is an abundant number, since it is smaller than the sum of its proper divisors (1808243865).

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

1666971495 is an frugal number, since it uses more digits than its factorization.

1666971495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936 (or 921 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 54.

The square root of 1666971495 is about 40828.5622450754. The cubic root of 1666971495 is about 1185.7033798809.

The spelling of 1666971495 in words is "one billion, six hundred sixty-six million, nine hundred seventy-one thousand, four hundred ninety-five".