66397556607 has 8 divisors (see below), whose sum is σ = 88531542576. Its totient is φ = 44264304192.

The previous prime is 66397556573. The next prime is 66397556657. The reversal of 66397556607 is 70665579366.

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

It is not a de Polignac number, because 66397556607 - 2⁷ = 66397556479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66397556657) 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, 83163 + ... + 373779.

It is an arithmetic number, because the mean of its divisors is an integer number (11066442822).

Almost surely, 2^66397556607 is an apocalyptic number.

66397556607 is a deficient number, since it is larger than the sum of its proper divisors (22133985969).

66397556607 is a wasteful number, since it uses less digits than its factorization.

66397556607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366777.

The product of its (nonzero) digits is 42865200, while the sum is 60.

The spelling of 66397556607 in words is "sixty-six billion, three hundred ninety-seven million, five hundred fifty-six thousand, six hundred seven".