1266661000 has 64 divisors (see below), whose sum is σ = 3233468160. Its totient is φ = 460600000.

The previous prime is 1266660979. The next prime is 1266661009. The reversal of 1266661000 is 1666621.

It is a self number, because there is not a number n which added to its sum of digits gives 1266661000.

It is not an unprimeable number, because it can be changed into a prime (1266661009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46576 + ... + 68575.

It is an arithmetic number, because the mean of its divisors is an integer number (50522940).

Almost surely, 2^1266661000 is an apocalyptic number.

1266661000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1266661000 is an abundant number, since it is smaller than the sum of its proper divisors (1966807160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1266661000 is a wasteful number, since it uses less digits than its factorization.

1266661000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115183 (or 115169 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 1266661000 is about 35590.1812302213. The cubic root of 1266661000 is about 1081.9822420361.

It can be divided in two parts, 1266 and 661000, that added together give a palindrome (662266).

The spelling of 1266661000 in words is "one billion, two hundred sixty-six million, six hundred sixty-one thousand".