66918067750 has 32 divisors (see below), whose sum is σ = 125822582496. Its totient is φ = 26649287200.

The previous prime is 66918067693. The next prime is 66918067751. The reversal of 66918067750 is 5776081966.

It is a junction number, because it is equal to n+sod(n) for n = 66918067691 and 66918067700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66918067751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 532837 + ... + 646336.

It is an arithmetic number, because the mean of its divisors is an integer number (3931955703).

Almost surely, 2^66918067750 is an apocalyptic number.

66918067750 is a deficient number, since it is larger than the sum of its proper divisors (58904514746).

66918067750 is a wasteful number, since it uses less digits than its factorization.

66918067750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1179417 (or 1179407 counting only the distinct ones).

The product of its (nonzero) digits is 3810240, while the sum is 55.

The spelling of 66918067750 in words is "sixty-six billion, nine hundred eighteen million, sixty-seven thousand, seven hundred fifty".