1266820846 has 4 divisors (see below), whose sum is σ = 1900231272. Its totient is φ = 633410422.

The previous prime is 1266820843. The next prime is 1266820847. The reversal of 1266820846 is 6480286621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6480286621 = 1949 ⋅3324929.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266820843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 316705210 + ... + 316705213.

It is an arithmetic number, because the mean of its divisors is an integer number (475057818).

Almost surely, 2^1266820846 is an apocalyptic number.

1266820846 is a deficient number, since it is larger than the sum of its proper divisors (633410426).

1266820846 is an equidigital number, since it uses as much as digits as its factorization.

1266820846 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633410425.

The product of its (nonzero) digits is 221184, while the sum is 43.

The square root of 1266820846 is about 35592.4268068363. The cubic root of 1266820846 is about 1082.0277536236.

The spelling of 1266820846 in words is "one billion, two hundred sixty-six million, eight hundred twenty thousand, eight hundred forty-six".