126665401 has 4 divisors (see below), whose sum is σ = 129611152. Its totient is φ = 123719652.

The previous prime is 126665369. The next prime is 126665449. The reversal of 126665401 is 104566621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 126665401 - 2⁵ = 126665369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126665471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1472811 + ... + 1472896.

It is an arithmetic number, because the mean of its divisors is an integer number (32402788).

Almost surely, 2^126665401 is an apocalyptic number.

It is an amenable number.

126665401 is a deficient number, since it is larger than the sum of its proper divisors (2945751).

126665401 is an equidigital number, since it uses as much as digits as its factorization.

126665401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2945750.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 126665401 is about 11254.5724485651. The cubic root of 126665401 is about 502.2107454692.

The spelling of 126665401 in words is "one hundred twenty-six million, six hundred sixty-five thousand, four hundred one".