1266061800 has 48 divisors (see below), whose sum is σ = 3924793440. Its totient is φ = 337616320.

The previous prime is 1266061777. The next prime is 1266061807. The reversal of 1266061800 is 81606621.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (1266061807) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1054452 + ... + 1055651.

It is an arithmetic number, because the mean of its divisors is an integer number (81766530).

Almost surely, 2^1266061800 is an apocalyptic number.

1266061800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1266061800 is an abundant number, since it is smaller than the sum of its proper divisors (2658731640).

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

1266061800 is a wasteful number, since it uses less digits than its factorization.

1266061800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2110122 (or 2110113 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 1266061800 is about 35581.7621823316. The cubic root of 1266061800 is about 1081.8116028471.

The spelling of 1266061800 in words is "one billion, two hundred sixty-six million, sixty-one thousand, eight hundred".