66869047751985 has 96 divisors (see below), whose sum is σ = 117598480576512. Its totient is φ = 35146720627200.

The previous prime is 66869047751977. The next prime is 66869047751993. The reversal of 66869047751985 is 58915774096866.

It is a happy number.

66869047751985 is a `hidden beast` number, since 6 + 6 + 8 + 6 + 9 + 0 + 477 + 51 + 98 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (66869047751977) and next prime (66869047751993).

It is not a de Polignac number, because 66869047751985 - 2³ = 66869047751977 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3634770807 + ... + 3634789203.

It is an arithmetic number, because the mean of its divisors is an integer number (1224984172672).

Almost surely, 2^{66869047751985} is an apocalyptic number.

It is an amenable number.

66869047751985 is a deficient number, since it is larger than the sum of its proper divisors (50729432824527).

66869047751985 is a wasteful number, since it uses less digits than its factorization.

66869047751985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22743 (or 22740 counting only the distinct ones).

The product of its (nonzero) digits is 5486745600, while the sum is 81.

The spelling of 66869047751985 in words is "sixty-six trillion, eight hundred sixty-nine billion, forty-seven million, seven hundred fifty-one thousand, nine hundred eighty-five".