129785650408 has 32 divisors (see below), whose sum is σ = 257814981000. Its totient is φ = 61039501312.

The previous prime is 129785650403. The next prime is 129785650411. The reversal of 129785650408 is 804056587921.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 128406122244 + 1379528164 = 358338^2 + 37142^2 .

It is not an unprimeable number, because it can be changed into a prime (129785650403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50383 + ... + 511966.

Almost surely, 2^129785650408 is an apocalyptic number.

It is an amenable number.

129785650408 is a deficient number, since it is larger than the sum of its proper divisors (128029330592).

129785650408 is a wasteful number, since it uses less digits than its factorization.

129785650408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564069 (or 564065 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 55.

The spelling of 129785650408 in words is "one hundred twenty-nine billion, seven hundred eighty-five million, six hundred fifty thousand, four hundred eight".