129866427943 has 6 divisors (see below), whose sum is σ = 148419864456. Its totient is φ = 111313263852.

The previous prime is 129866427893. The next prime is 129866427961. The reversal of 129866427943 is 349724668921.

It is a happy number.

It is not a de Polignac number, because 129866427943 - 2¹⁷ = 129866296871 is a prime.

It is a super-2 number, since 2×129866427943² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129866427643) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 885346 + ... + 1021552.

It is an arithmetic number, because the mean of its divisors is an integer number (24736644076).

Almost surely, 2^129866427943 is an apocalyptic number.

129866427943 is a deficient number, since it is larger than the sum of its proper divisors (18553436513).

129866427943 is an frugal number, since it uses more digits than its factorization.

129866427943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272421 (or 136214 counting only the distinct ones).

The product of its digits is 31352832, while the sum is 61.

The spelling of 129866427943 in words is "one hundred twenty-nine billion, eight hundred sixty-six million, four hundred twenty-seven thousand, nine hundred forty-three".