126631665 has 24 divisors (see below), whose sum is σ = 220496640. Its totient is φ = 67228704.

The previous prime is 126631651. The next prime is 126631697. The reversal of 126631665 is 566136621.

126631665 is a `hidden beast` number, since 12 + 6 + 631 + 6 + 6 + 5 = 666.

It is not a de Polignac number, because 126631665 - 2⁵ = 126631633 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3726 + ... + 16344.

It is an arithmetic number, because the mean of its divisors is an integer number (9187360).

Almost surely, 2^126631665 is an apocalyptic number.

126631665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

126631665 is a deficient number, since it is larger than the sum of its proper divisors (93864975).

126631665 is a wasteful number, since it uses less digits than its factorization.

126631665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12853 (or 12850 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 126631665 is about 11253.0735801380. The cubic root of 126631665 is about 502.1661553234.

The spelling of 126631665 in words is "one hundred twenty-six million, six hundred thirty-one thousand, six hundred sixty-five".