66705893 has 12 divisors (see below), whose sum is σ = 70649964. Its totient is φ = 62942400.

The previous prime is 66705889. The next prime is 66705901. The reversal of 66705893 is 39850766.

It can be written as a sum of positive squares in 2 ways, for example, as 12271009 + 54434884 = 3503^2 + 7378^2 .

It is not a de Polignac number, because 66705893 - 2² = 66705889 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66705823) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38555 + ... + 40247.

It is an arithmetic number, because the mean of its divisors is an integer number (5887497).

Almost surely, 2^66705893 is an apocalyptic number.

It is an amenable number.

66705893 is a deficient number, since it is larger than the sum of its proper divisors (3944071).

66705893 is a wasteful number, since it uses less digits than its factorization.

66705893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1796 (or 1765 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 66705893 is about 8167.3675685621. The cubic root of 66705893 is about 405.5596449398.

The spelling of 66705893 in words is "sixty-six million, seven hundred five thousand, eight hundred ninety-three".