66761611727056 has 20 divisors (see below), whose sum is σ = 129763883506372. Its totient is φ = 33274157918976.

The previous prime is 66761611727053. The next prime is 66761611727147. The reversal of 66761611727056 is 65072711616766.

It can be written as a sum of positive squares in 2 ways, for example, as 4739938579600 + 62021673147456 = 2177140^2 + 7875384^2 .

It is a super-2 number, since 2×66761611727056² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66761611726985 and 66761611727003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66761611727053) 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, 6665491371 + ... + 6665501386.

Almost surely, 2^{66761611727056} is an apocalyptic number.

It is an amenable number.

66761611727056 is a deficient number, since it is larger than the sum of its proper divisors (63002271779316).

66761611727056 is a wasteful number, since it uses less digits than its factorization.

66761611727056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13330993078 (or 13330993072 counting only the distinct ones).

The product of its (nonzero) digits is 26671680, while the sum is 61.

The spelling of 66761611727056 in words is "sixty-six trillion, seven hundred sixty-one billion, six hundred eleven million, seven hundred twenty-seven thousand, fifty-six".