67139389512 has 224 divisors, whose sum is σ = 203822640000. Its totient is φ = 20601330048.

The previous prime is 67139389483. The next prime is 67139389517. The reversal of 67139389512 is 21598393176.

67139389512 is a `hidden beast` number, since 67 + 1 + 39 + 38 + 9 + 512 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (67139389517) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 33585489 + ... + 33587487.

It is an arithmetic number, because the mean of its divisors is an integer number (909922500).

Almost surely, 2^67139389512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 67139389512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101911320000).

67139389512 is an abundant number, since it is smaller than the sum of its proper divisors (136683250488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

67139389512 is a wasteful number, since it uses less digits than its factorization.

67139389512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2479 (or 2460 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 54.

The spelling of 67139389512 in words is "sixty-seven billion, one hundred thirty-nine million, three hundred eighty-nine thousand, five hundred twelve".