126856720650 has 72 divisors (see below), whose sum is σ = 345805179552. Its totient is φ = 30753140000.

The previous prime is 126856720619. The next prime is 126856720673. The reversal of 126856720650 is 56027658621.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 126856720650.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3476526 + ... + 3512825.

It is an arithmetic number, because the mean of its divisors is an integer number (4802849716).

Almost surely, 2^126856720650 is an apocalyptic number.

126856720650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

126856720650 is an abundant number, since it is smaller than the sum of its proper divisors (218948458902).

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

126856720650 is a wasteful number, since it uses less digits than its factorization.

126856720650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6989388 (or 6989372 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 48.

The spelling of 126856720650 in words is "one hundred twenty-six billion, eight hundred fifty-six million, seven hundred twenty thousand, six hundred fifty".