126779661 has 14 divisors (see below), whose sum is σ = 190083630. Its totient is φ = 84519288.

The previous prime is 126779651. The next prime is 126779683. The reversal of 126779661 is 166977621.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 75585636 + 51194025 = 8694^2 + 7155^2 .

It is not a de Polignac number, because 126779661 - 2⁵ = 126779629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126779651) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 86226 + ... + 87683.

Almost surely, 2^126779661 is an apocalyptic number.

It is an amenable number.

126779661 is a deficient number, since it is larger than the sum of its proper divisors (63303969).

126779661 is an frugal number, since it uses more digits than its factorization.

126779661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173927 (or 173912 counting only the distinct ones).

The product of its digits is 190512, while the sum is 45.

The square root of 126779661 is about 11259.6474633978. The cubic root of 126779661 is about 502.3617084361.

The spelling of 126779661 in words is "one hundred twenty-six million, seven hundred seventy-nine thousand, six hundred sixty-one".