66902170651 has 8 divisors (see below), whose sum is σ = 71106941664. Its totient is φ = 62727327360.

The previous prime is 66902170639. The next prime is 66902170661. The reversal of 66902170651 is 15607120966.

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 66902170651 - 2³¹ = 64754687003 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66902170598 and 66902170607.

It is not an unprimeable number, because it can be changed into a prime (66902170631) 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, 7477320 + ... + 7486261.

It is an arithmetic number, because the mean of its divisors is an integer number (8888367708).

Almost surely, 2^66902170651 is an apocalyptic number.

66902170651 is a deficient number, since it is larger than the sum of its proper divisors (4204771013).

66902170651 is a wasteful number, since it uses less digits than its factorization.

66902170651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14963861.

The product of its (nonzero) digits is 136080, while the sum is 43.

The spelling of 66902170651 in words is "sixty-six billion, nine hundred two million, one hundred seventy thousand, six hundred fifty-one".