66790011785 has 12 divisors (see below), whose sum is σ = 93233404548. Its totient is φ = 45798865056.

The previous prime is 66790011767. The next prime is 66790012007. The reversal of 66790011785 is 58711009766.

It can be written as a sum of positive squares in 2 ways, for example, as 15339070201 + 51450941584 = 123851^2 + 226828^2 .

It is not a de Polignac number, because 66790011785 - 2²² = 66785817481 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 136305902 + ... + 136306391.

It is an arithmetic number, because the mean of its divisors is an integer number (7769450379).

Almost surely, 2^66790011785 is an apocalyptic number.

It is an amenable number.

66790011785 is a deficient number, since it is larger than the sum of its proper divisors (26443392763).

66790011785 is a wasteful number, since it uses less digits than its factorization.

66790011785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272612312 (or 272612305 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 50.

The spelling of 66790011785 in words is "sixty-six billion, seven hundred ninety million, eleven thousand, seven hundred eighty-five".