66139061611392 has 640 divisors, whose sum is σ = 246478634138880. Its totient is φ = 17103251865600.

The previous prime is 66139061611367. The next prime is 66139061611481. The reversal of 66139061611392 is 29311616093166.

66139061611392 is a `hidden beast` number, since 6 + 6 + 1 + 3 + 9 + 0 + 616 + 1 + 13 + 9 + 2 = 666.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 181039792 + ... + 181404752.

It is an arithmetic number, because the mean of its divisors is an integer number (385122865842).

Almost surely, 2^{66139061611392} 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 66139061611392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123239317069440).

66139061611392 is an abundant number, since it is smaller than the sum of its proper divisors (180339572527488).

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

66139061611392 is a wasteful number, since it uses less digits than its factorization.

66139061611392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365232 (or 365211 counting only the distinct ones).

The product of its (nonzero) digits is 1889568, while the sum is 54.

The spelling of 66139061611392 in words is "sixty-six trillion, one hundred thirty-nine billion, sixty-one million, six hundred eleven thousand, three hundred ninety-two".