131212597666 has 8 divisors (see below), whose sum is σ = 208396478700. Its totient is φ = 61747104768.

The previous prime is 131212597639. The next prime is 131212597757. The reversal of 131212597666 is 666795212131.

It can be written as a sum of positive squares in 2 ways, for example, as 130878256441 + 334341225 = 361771^2 + 18285^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1929596991 + ... + 1929597058.

Almost surely, 2^131212597666 is an apocalyptic number.

131212597666 is a deficient number, since it is larger than the sum of its proper divisors (77183881034).

131212597666 is a wasteful number, since it uses less digits than its factorization.

131212597666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3859194068.

The product of its digits is 816480, while the sum is 49.

The spelling of 131212597666 in words is "one hundred thirty-one billion, two hundred twelve million, five hundred ninety-seven thousand, six hundred sixty-six".