1266164815 has 8 divisors (see below), whose sum is σ = 1524253968. Its totient is φ = 1009694400.

The previous prime is 1266164813. The next prime is 1266164821. The reversal of 1266164815 is 5184616621.

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

It is not a de Polignac number, because 1266164815 - 2¹ = 1266164813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266164813) 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, 402961 + ... + 406090.

It is an arithmetic number, because the mean of its divisors is an integer number (190531746).

Almost surely, 2^1266164815 is an apocalyptic number.

1266164815 is a deficient number, since it is larger than the sum of its proper divisors (258089153).

1266164815 is an equidigital number, since it uses as much as digits as its factorization.

1266164815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809369.

The product of its digits is 69120, while the sum is 40.

The square root of 1266164815 is about 35583.2097343677. The cubic root of 1266164815 is about 1081.8409431210.

The spelling of 1266164815 in words is "one billion, two hundred sixty-six million, one hundred sixty-four thousand, eight hundred fifteen".