1266262552820 has 18 divisors (see below), whose sum is σ = 2659161929046. Its totient is φ = 506503008160.

The previous prime is 1266262552801. The next prime is 1266262552847. The reversal of 1266262552820 is 282552626621.

It can be written as a sum of positive squares in 3 ways, for example, as 18399294736 + 1247863258084 = 135644^2 + 1117078^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4906610 + ... + 5158230.

Almost surely, 2^{1266262552820} is an apocalyptic number.

1266262552820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1266262552820 is an abundant number, since it is smaller than the sum of its proper divisors (1392899376226).

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

1266262552820 is an frugal number, since it uses more digits than its factorization.

1266262552820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503251 (or 251628 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 47.

The spelling of 1266262552820 in words is "one trillion, two hundred sixty-six billion, two hundred sixty-two million, five hundred fifty-two thousand, eight hundred twenty".