129400218769 has 4 divisors (see below), whose sum is σ = 130013490160. Its totient is φ = 128786947380.

The previous prime is 129400218767. The next prime is 129400218793. The reversal of 129400218769 is 967812004921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 129400218769 - 2¹ = 129400218767 is a prime.

It is a super-2 number, since 2×129400218769² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129400218763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 306635379 + ... + 306635800.

It is an arithmetic number, because the mean of its divisors is an integer number (32503372540).

Almost surely, 2^129400218769 is an apocalyptic number.

It is an amenable number.

129400218769 is a deficient number, since it is larger than the sum of its proper divisors (613271391).

129400218769 is an equidigital number, since it uses as much as digits as its factorization.

129400218769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613271390.

The product of its (nonzero) digits is 435456, while the sum is 49.

The spelling of 129400218769 in words is "one hundred twenty-nine billion, four hundred million, two hundred eighteen thousand, seven hundred sixty-nine".