129772261280 has 24 divisors (see below), whose sum is σ = 306586967652. Its totient is φ = 51908904448.

The previous prime is 129772261279. The next prime is 129772261291. The reversal of 129772261280 is 82162277921.

It can be written as a sum of positive squares in 2 ways, for example, as 107765132176 + 22007129104 = 328276^2 + 148348^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 405538157 + ... + 405538476.

Almost surely, 2^129772261280 is an apocalyptic number.

129772261280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129772261280 is an abundant number, since it is smaller than the sum of its proper divisors (176814706372).

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

129772261280 is an equidigital number, since it uses as much as digits as its factorization.

129772261280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811076648 (or 811076640 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 47.

The spelling of 129772261280 in words is "one hundred twenty-nine billion, seven hundred seventy-two million, two hundred sixty-one thousand, two hundred eighty".