66757262797 has 4 divisors (see below), whose sum is σ = 67602291520. Its totient is φ = 65912234076.

The previous prime is 66757262779. The next prime is 66757262807. The reversal of 66757262797 is 79726275766.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66757262797 is a prime.

It is a super-2 number, since 2×66757262797² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66757269797) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 422514243 + ... + 422514400.

It is an arithmetic number, because the mean of its divisors is an integer number (16900572880).

Almost surely, 2^66757262797 is an apocalyptic number.

It is an amenable number.

66757262797 is a deficient number, since it is larger than the sum of its proper divisors (845028723).

66757262797 is an equidigital number, since it uses as much as digits as its factorization.

66757262797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 845028722.

The product of its digits is 93350880, while the sum is 64.

The spelling of 66757262797 in words is "sixty-six billion, seven hundred fifty-seven million, two hundred sixty-two thousand, seven hundred ninety-seven".