129912111668 has 6 divisors (see below), whose sum is σ = 227346195426. Its totient is φ = 64956055832.

The previous prime is 129912111619. The next prime is 129912111671. The reversal of 129912111668 is 866111219921.

It can be written as a sum of positive squares in only one way, i.e., 127212062224 + 2700049444 = 356668^2 + 51962^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16239013955 + ... + 16239013962.

It is an arithmetic number, because the mean of its divisors is an integer number (37891032571).

Almost surely, 2^129912111668 is an apocalyptic number.

It is an amenable number.

129912111668 is a deficient number, since it is larger than the sum of its proper divisors (97434083758).

129912111668 is a wasteful number, since it uses less digits than its factorization.

129912111668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32478027921 (or 32478027919 counting only the distinct ones).

The product of its digits is 93312, while the sum is 47.

The spelling of 129912111668 in words is "one hundred twenty-nine billion, nine hundred twelve million, one hundred eleven thousand, six hundred sixty-eight".