66801111730757 has 4 divisors (see below), whose sum is σ = 66801133724640. Its totient is φ = 66801089736876.

The previous prime is 66801111730741. The next prime is 66801111730783. The reversal of 66801111730757 is 75703711110866.

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 not a de Polignac number, because 66801111730757 - 2⁴ = 66801111730741 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66801111730699 and 66801111730708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66801111733757) 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, 5537657 + ... + 12816702.

It is an arithmetic number, because the mean of its divisors is an integer number (16700283431160).

Almost surely, 2^{66801111730757} is an apocalyptic number.

It is an amenable number.

66801111730757 is a deficient number, since it is larger than the sum of its proper divisors (21993883).

66801111730757 is a wasteful number, since it uses less digits than its factorization.

66801111730757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21993882.

The product of its (nonzero) digits is 1481760, while the sum is 53.

The spelling of 66801111730757 in words is "sixty-six trillion, eight hundred one billion, one hundred eleven million, seven hundred thirty thousand, seven hundred fifty-seven".