75666805776 has 165 divisors, whose sum is σ = 220685209599. Its totient is φ = 25133143968.

The previous prime is 75666805757. The next prime is 75666805777. The reversal of 75666805776 is 67750866657.

The square root of 75666805776 is 275076.

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

It is not an unprimeable number, because it can be changed into a prime (75666805777) by changing a digit.

It is a polite number, since it can be written in 32 ways as a sum of consecutive naturals, for example, 267373731 + ... + 267374013.

Almost surely, 2^75666805776 is an apocalyptic number.

75666805776 is the 275076-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 75666805776

75666805776 is an abundant number, since it is smaller than the sum of its proper divisors (145018403823).

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

75666805776 is an frugal number, since it uses more digits than its factorization.

75666805776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604 (or 288 counting only the distinct ones).

The product of its (nonzero) digits is 88905600, while the sum is 63.

The spelling of 75666805776 in words is "seventy-five billion, six hundred sixty-six million, eight hundred five thousand, seven hundred seventy-six".