1266206552 has 64 divisors (see below), whose sum is σ = 2661120000. Its totient is φ = 561020544.

The previous prime is 1266206533. The next prime is 1266206573. The reversal of 1266206552 is 2556026621.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 261449 + ... + 266247.

It is an arithmetic number, because the mean of its divisors is an integer number (41580000).

Almost surely, 2^1266206552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1266206552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1330560000).

1266206552 is an abundant number, since it is smaller than the sum of its proper divisors (1394913448).

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

1266206552 is a wasteful number, since it uses less digits than its factorization.

1266206552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4920 (or 4916 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 1266206552 is about 35583.7961999560. The cubic root of 1266206552 is about 1081.8528300146.

The spelling of 1266206552 in words is "one billion, two hundred sixty-six million, two hundred six thousand, five hundred fifty-two".