66319640676 has 189 divisors, whose sum is σ = 184384455843. Its totient is φ = 20859606000.

The previous prime is 66319640641. The next prime is 66319640707. The reversal of 66319640676 is 67604691366.

The square root of 66319640676 is 257526.

It is a perfect power (a square), and thus also a powerful number.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 264221551 + ... + 264221801.

Almost surely, 2^66319640676 is an apocalyptic number.

66319640676 is the 257526-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66319640676

66319640676 is an abundant number, since it is smaller than the sum of its proper divisors (118064815167).

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

66319640676 is an equidigital number, since it uses as much as digits as its factorization.

66319640676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562 (or 275 counting only the distinct ones).

The product of its (nonzero) digits is 5878656, while the sum is 54.

The spelling of 66319640676 in words is "sixty-six billion, three hundred nineteen million, six hundred forty thousand, six hundred seventy-six".