1971574668 has 84 divisors (see below), whose sum is σ = 5912080720. Its totient is φ = 563301216.

The previous prime is 1971574607. The next prime is 1971574699. The reversal of 1971574668 is 8664751791.

1971574668 is a `hidden beast` number, since 1 + 9 + 7 + 1 + 574 + 6 + 68 = 666.

It is a tau number, because it is divible by the number of its divisors (84).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 27883 + ... + 68706.

Almost surely, 2^1971574668 is an apocalyptic number.

1971574668 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1971574668 is an abundant number, since it is smaller than the sum of its proper divisors (3940506052).

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

1971574668 is an equidigital number, since it uses as much as digits as its factorization.

1971574668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96618 (or 96601 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 54.

The square root of 1971574668 is about 44402.4173666254. The cubic root of 1971574668 is about 1253.9236005743.

The spelling of 1971574668 in words is "one billion, nine hundred seventy-one million, five hundred seventy-four thousand, six hundred sixty-eight".