1197819666 has 24 divisors (see below), whose sum is σ = 2601828684. Its totient is φ = 398265120.

The previous prime is 1197819661. The next prime is 1197819671. The reversal of 1197819666 is 6669187911.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1197819661) and next prime (1197819671).

It can be written as a sum of positive squares in 2 ways, for example, as 1090386441 + 107433225 = 33021^2 + 10365^2 .

It is not an unprimeable number, because it can be changed into a prime (1197819661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 76665 + ... + 90956.

Almost surely, 2^1197819666 is an apocalyptic number.

1197819666 is an abundant number, since it is smaller than the sum of its proper divisors (1404009018).

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

1197819666 is a wasteful number, since it uses less digits than its factorization.

1197819666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168026 (or 168023 counting only the distinct ones).

The product of its digits is 979776, while the sum is 54.

The square root of 1197819666 is about 34609.5314328293. The cubic root of 1197819666 is about 1062.0145816037.

The spelling of 1197819666 in words is "one billion, one hundred ninety-seven million, eight hundred nineteen thousand, six hundred sixty-six".