66790685 has 8 divisors (see below), whose sum is σ = 86314200. Its totient is φ = 49322304.

The previous prime is 66790679. The next prime is 66790699. The reversal of 66790685 is 58609766.

It can be written as a sum of positive squares in 4 ways, for example, as 1923769 + 64866916 = 1387^2 + 8054^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 66790685 - 2¹⁰ = 66789661 is a prime.

It is a super-3 number, since 3×66790685³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 513710 + ... + 513839.

It is an arithmetic number, because the mean of its divisors is an integer number (10789275).

Almost surely, 2^66790685 is an apocalyptic number.

66790685 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66790685 is a deficient number, since it is larger than the sum of its proper divisors (19523515).

66790685 is a wasteful number, since it uses less digits than its factorization.

66790685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1027567.

The product of its (nonzero) digits is 544320, while the sum is 47.

The square root of 66790685 is about 8172.5568214605. The cubic root of 66790685 is about 405.7314121380.

The spelling of 66790685 in words is "sixty-six million, seven hundred ninety thousand, six hundred eighty-five".