129780999569 has 8 divisors (see below), whose sum is σ = 139815594240. Its totient is φ = 119753753616.

The previous prime is 129780999539. The next prime is 129780999587. The reversal of 129780999569 is 965999087921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129780999569 - 2¹² = 129780995473 is a prime.

It is a super-2 number, since 2×129780999569² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129780999496 and 129780999505.

It is not an unprimeable number, because it can be changed into a prime (129780999529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1800467 + ... + 1871160.

It is an arithmetic number, because the mean of its divisors is an integer number (17476949280).

Almost surely, 2^129780999569 is an apocalyptic number.

It is an amenable number.

129780999569 is a deficient number, since it is larger than the sum of its proper divisors (10034594671).

129780999569 is a wasteful number, since it uses less digits than its factorization.

129780999569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3674359.

The product of its (nonzero) digits is 198404640, while the sum is 74.

The spelling of 129780999569 in words is "one hundred twenty-nine billion, seven hundred eighty million, nine hundred ninety-nine thousand, five hundred sixty-nine".