66761036657704 has 8 divisors (see below), whose sum is σ = 125176943733210. Its totient is φ = 33380518328848.

The previous prime is 66761036657671. The next prime is 66761036657723. The reversal of 66761036657704 is 40775663016766.

It can be written as a sum of positive squares in only one way, i.e., 66616644257604 + 144392400100 = 8161902^2 + 379990^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×66761036657704² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4172564791099 + ... + 4172564791114.

Almost surely, 2^{66761036657704} is an apocalyptic number.

It is an amenable number.

66761036657704 is a deficient number, since it is larger than the sum of its proper divisors (58415907075506).

66761036657704 is a wasteful number, since it uses less digits than its factorization.

66761036657704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8345129582219 (or 8345129582215 counting only the distinct ones).

The product of its (nonzero) digits is 160030080, while the sum is 64.

The spelling of 66761036657704 in words is "sixty-six trillion, seven hundred sixty-one billion, thirty-six million, six hundred fifty-seven thousand, seven hundred four".