67129073721 has 48 divisors (see below), whose sum is σ = 102620044800. Its totient is φ = 42217056000.

The previous prime is 67129073677. The next prime is 67129073761. The reversal of 67129073721 is 12737092176.

It is not a de Polignac number, because 67129073721 - 2¹⁷ = 67128942649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (67129073761) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 22293106 + ... + 22296116.

It is an arithmetic number, because the mean of its divisors is an integer number (2137917600).

Almost surely, 2^67129073721 is an apocalyptic number.

It is an amenable number.

67129073721 is a deficient number, since it is larger than the sum of its proper divisors (35490971079).

67129073721 is a wasteful number, since it uses less digits than its factorization.

67129073721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5038 (or 5035 counting only the distinct ones).

The product of its (nonzero) digits is 222264, while the sum is 45.

The spelling of 67129073721 in words is "sixty-seven billion, one hundred twenty-nine million, seventy-three thousand, seven hundred twenty-one".