1266560220 has 48 divisors (see below), whose sum is σ = 3594961440. Its totient is φ = 333121536.

The previous prime is 1266560213. The next prime is 1266560221. The reversal of 1266560220 is 220656621.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266560221) 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, 140205 + ... + 148964.

It is an arithmetic number, because the mean of its divisors is an integer number (74895030).

Almost surely, 2^1266560220 is an apocalyptic number.

1266560220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1266560220 is an abundant number, since it is smaller than the sum of its proper divisors (2328401220).

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

1266560220 is a wasteful number, since it uses less digits than its factorization.

1266560220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289254 (or 289252 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 1266560220 is about 35588.7653621195. The cubic root of 1266560220 is about 1081.9535458387.

The spelling of 1266560220 in words is "one billion, two hundred sixty-six million, five hundred sixty thousand, two hundred twenty".