1266653864 has 16 divisors (see below), whose sum is σ = 2714258400. Its totient is φ = 542851632.

The previous prime is 1266653821. The next prime is 1266653887. The reversal of 1266653864 is 4683566621.

It is a happy number.

It is a super-2 number, since 2×1266653864² = 3208824022372260992, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11309354 + ... + 11309465.

It is an arithmetic number, because the mean of its divisors is an integer number (169641150).

Almost surely, 2^1266653864 is an apocalyptic number.

1266653864 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1266653864 is an abundant number, since it is smaller than the sum of its proper divisors (1447604536).

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

1266653864 is a wasteful number, since it uses less digits than its factorization.

1266653864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22618832 (or 22618828 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 47.

The square root of 1266653864 is about 35590.0809777106. The cubic root of 1266653864 is about 1081.9802101744.

The spelling of 1266653864 in words is "one billion, two hundred sixty-six million, six hundred fifty-three thousand, eight hundred sixty-four".