12966161257621 has 12 divisors (see below), whose sum is σ = 15348373976236. Its totient is φ = 10880694760320.

The previous prime is 12966161257619. The next prime is 12966161257661. The reversal of 12966161257621 is 12675216166921.

It can be written as a sum of positive squares in 2 ways, for example, as 6055098625521 + 6911062632100 = 2460711^2 + 2628890^2 .

It is not a de Polignac number, because 12966161257621 - 2¹ = 12966161257619 is a prime.

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12966161257601) 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, 4121473716 + ... + 4121476861.

Almost surely, 2^{12966161257621} is an apocalyptic number.

12966161257621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12966161257621 is a deficient number, since it is larger than the sum of its proper divisors (2382212718615).

12966161257621 is a wasteful number, since it uses less digits than its factorization.

12966161257621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8242950612 (or 8242950601 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 55.

The spelling of 12966161257621 in words is "twelve trillion, nine hundred sixty-six billion, one hundred sixty-one million, two hundred fifty-seven thousand, six hundred twenty-one".