126997661 has 12 divisors (see below), whose sum is σ = 149172192. Its totient is φ = 107794008.

The previous prime is 126997657. The next prime is 126997679. The reversal of 126997661 is 166799621.

It is not a de Polignac number, because 126997661 - 2² = 126997657 is a prime.

It is a super-2 number, since 2×126997661² = 32256811798941842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126997681) 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, 7535 + ... + 17628.

It is an arithmetic number, because the mean of its divisors is an integer number (12431016).

Almost surely, 2^126997661 is an apocalyptic number.

It is an amenable number.

126997661 is a deficient number, since it is larger than the sum of its proper divisors (22174531).

126997661 is a wasteful number, since it uses less digits than its factorization.

126997661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25280 (or 25273 counting only the distinct ones).

The product of its digits is 244944, while the sum is 47.

The square root of 126997661 is about 11269.3238927630. The cubic root of 126997661 is about 502.6494836742.

The spelling of 126997661 in words is "one hundred twenty-six million, nine hundred ninety-seven thousand, six hundred sixty-one".