1266640123 has 8 divisors (see below), whose sum is σ = 1447866848. Its totient is φ = 1085482944.

The previous prime is 1266640117. The next prime is 1266640127. The reversal of 1266640123 is 3210466621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1266640123 - 2¹³ = 1266631931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1266640127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30415 + ... + 58807.

It is an arithmetic number, because the mean of its divisors is an integer number (180983356).

Almost surely, 2^1266640123 is an apocalyptic number.

1266640123 is a deficient number, since it is larger than the sum of its proper divisors (181226725).

1266640123 is an equidigital number, since it uses as much as digits as its factorization.

1266640123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34773.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 1266640123 is about 35589.8879318269. The cubic root of 1266640123 is about 1081.9762976234.

The spelling of 1266640123 in words is "one billion, two hundred sixty-six million, six hundred forty thousand, one hundred twenty-three".