126601666 has 4 divisors (see below), whose sum is σ = 189902502. Its totient is φ = 63300832.

The previous prime is 126601661. The next prime is 126601711. The reversal of 126601666 is 666106621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 126090441 + 511225 = 11229^2 + 715^2 .

It is not an unprimeable number, because it can be changed into a prime (126601661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31650415 + ... + 31650418.

Almost surely, 2^126601666 is an apocalyptic number.

126601666 is a deficient number, since it is larger than the sum of its proper divisors (63300836).

126601666 is an equidigital number, since it uses as much as digits as its factorization.

126601666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63300835.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 126601666 is about 11251.7405764619. The cubic root of 126601666 is about 502.1264978590.

The spelling of 126601666 in words is "one hundred twenty-six million, six hundred one thousand, six hundred sixty-six".