66317693754 has 64 divisors (see below), whose sum is σ = 147832070400. Its totient is φ = 19692675072.

The previous prime is 66317693707. The next prime is 66317693779. The reversal of 66317693754 is 45739671366.

It is a super-2 number, since 2×66317693754² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66317693694 and 66317693703.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6077067 + ... + 6087969.

It is an arithmetic number, because the mean of its divisors is an integer number (2309876100).

Almost surely, 2^66317693754 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66317693754, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73916035200).

66317693754 is an abundant number, since it is smaller than the sum of its proper divisors (81514376646).

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

66317693754 is a wasteful number, since it uses less digits than its factorization.

66317693754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13639.

The product of its digits is 17146080, while the sum is 57.

The spelling of 66317693754 in words is "sixty-six billion, three hundred seventeen million, six hundred ninety-three thousand, seven hundred fifty-four".