126805864520 has 16 divisors (see below), whose sum is σ = 285313195260. Its totient is φ = 50722345792.

The previous prime is 126805864513. The next prime is 126805864553. The reversal of 126805864520 is 25468508621.

It can be written as a sum of positive squares in 2 ways, for example, as 119894602564 + 6911261956 = 346258^2 + 83134^2 .

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, 1585073267 + ... + 1585073346.

Almost surely, 2^126805864520 is an apocalyptic number.

126805864520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

126805864520 is an abundant number, since it is smaller than the sum of its proper divisors (158507330740).

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

126805864520 is a wasteful number, since it uses less digits than its factorization.

126805864520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3170146624 (or 3170146620 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 47.

The spelling of 126805864520 in words is "one hundred twenty-six billion, eight hundred five million, eight hundred sixty-four thousand, five hundred twenty".