66565125061 has 4 divisors (see below), whose sum is σ = 67089260032. Its totient is φ = 66040990092.

The previous prime is 66565125059. The next prime is 66565125071. The reversal of 66565125061 is 16052156566.

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 not a de Polignac number, because 66565125061 - 2¹ = 66565125059 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66565124999 and 66565125017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66565125071) 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, 262067295 + ... + 262067548.

It is an arithmetic number, because the mean of its divisors is an integer number (16772315008).

Almost surely, 2^66565125061 is an apocalyptic number.

It is an amenable number.

66565125061 is a deficient number, since it is larger than the sum of its proper divisors (524134971).

66565125061 is a wasteful number, since it uses less digits than its factorization.

66565125061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524134970.

The product of its (nonzero) digits is 324000, while the sum is 43.

The spelling of 66565125061 in words is "sixty-six billion, five hundred sixty-five million, one hundred twenty-five thousand, sixty-one".