66692554528320 has 4480 divisors, whose sum is σ = 303946321231872. Its totient is φ = 13549997260800.

The previous prime is 66692554528279. The next prime is 66692554528421. The reversal of 66692554528320 is 2382545529666.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 639 ways as a sum of consecutive naturals, for example, 486806967292 + ... + 486806967428.

Almost surely, 2^{66692554528320} is an apocalyptic number.

66692554528320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66692554528320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (151973160615936).

66692554528320 is an abundant number, since it is smaller than the sum of its proper divisors (237253766703552).

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

66692554528320 is a wasteful number, since it uses less digits than its factorization.

66692554528320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351 (or 332 counting only the distinct ones).

The product of its (nonzero) digits is 186624000, while the sum is 63.

The spelling of 66692554528320 in words is "sixty-six trillion, six hundred ninety-two billion, five hundred fifty-four million, five hundred twenty-eight thousand, three hundred twenty".