66125041665 has 32 divisors (see below), whose sum is σ = 107361386496. Its totient is φ = 34746909120.

The previous prime is 66125041643. The next prime is 66125041687. The reversal of 66125041665 is 56614052166.

It is an interprime number because it is at equal distance from previous prime (66125041643) and next prime (66125041687).

It is not a de Polignac number, because 66125041665 - 2²² = 66120847361 is a prime.

It is a super-2 number, since 2×66125041665² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1649044 + ... + 1688666.

It is an arithmetic number, because the mean of its divisors is an integer number (3355043328).

Almost surely, 2^66125041665 is an apocalyptic number.

It is an amenable number.

66125041665 is a deficient number, since it is larger than the sum of its proper divisors (41236344831).

66125041665 is a wasteful number, since it uses less digits than its factorization.

66125041665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41269.

The product of its (nonzero) digits is 259200, while the sum is 42.

The spelling of 66125041665 in words is "sixty-six billion, one hundred twenty-five million, forty-one thousand, six hundred sixty-five".