66511672700057 has 8 divisors (see below), whose sum is σ = 71629431755784. Its totient is φ = 61394124578688.

The previous prime is 66511672699991. The next prime is 66511672700059. The reversal of 66511672700057 is 75000727611566.

It can be written as a sum of positive squares in 4 ways, for example, as 1159905306121 + 65351767393936 = 1076989^2 + 8084044^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66511672700057 - 2¹⁶ = 66511672634521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66511672699981 and 66511672700008.

It is not an unprimeable number, because it can be changed into a prime (66511672700059) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52078388 + ... + 53340245.

It is an arithmetic number, because the mean of its divisors is an integer number (8953678969473).

Almost surely, 2^{66511672700057} is an apocalyptic number.

It is an amenable number.

66511672700057 is a deficient number, since it is larger than the sum of its proper divisors (5117759055727).

66511672700057 is a wasteful number, since it uses less digits than its factorization.

66511672700057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105467179.

The product of its (nonzero) digits is 3704400, while the sum is 53.

The spelling of 66511672700057 in words is "sixty-six trillion, five hundred eleven billion, six hundred seventy-two million, seven hundred thousand, fifty-seven".