66861253375 has 48 divisors (see below), whose sum is σ = 100197616896. Its totient is φ = 44368632000.

The previous prime is 66861253331. The next prime is 66861253409. The reversal of 66861253375 is 57335216866.

It is not a de Polignac number, because 66861253375 - 2¹³ = 66861245183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13809 + ... + 365941.

It is an arithmetic number, because the mean of its divisors is an integer number (2087450352).

Almost surely, 2^66861253375 is an apocalyptic number.

66861253375 is a deficient number, since it is larger than the sum of its proper divisors (33336363521).

66861253375 is a wasteful number, since it uses less digits than its factorization.

66861253375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352193 (or 352176 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 52.

The spelling of 66861253375 in words is "sixty-six billion, eight hundred sixty-one million, two hundred fifty-three thousand, three hundred seventy-five".