66739186974 has 16 divisors (see below), whose sum is σ = 135306845712. Its totient is φ = 21941650368.

The previous prime is 66739186973. The next prime is 66739186981. The reversal of 66739186974 is 47968193766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66739186973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76185849 + ... + 76186724.

It is an arithmetic number, because the mean of its divisors is an integer number (8456677857).

Almost surely, 2^66739186974 is an apocalyptic number.

66739186974 is an abundant number, since it is smaller than the sum of its proper divisors (68567658738).

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

66739186974 is a wasteful number, since it uses less digits than its factorization.

66739186974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152372651.

The product of its digits is 82301184, while the sum is 66.

The spelling of 66739186974 in words is "sixty-six billion, seven hundred thirty-nine million, one hundred eighty-six thousand, nine hundred seventy-four".