66819536 has 30 divisors (see below), whose sum is σ = 150601410. Its totient is φ = 28636608.

The previous prime is 66819481. The next prime is 66819541. The reversal of 66819536 is 63591866.

It can be written as a sum of positive squares in only one way, i.e., 59290000 + 7529536 = 7700^2 + 2744^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 41831 + ... + 43398.

It is an arithmetic number, because the mean of its divisors is an integer number (5020047).

Almost surely, 2^66819536 is an apocalyptic number.

It is an amenable number.

66819536 is an abundant number, since it is smaller than the sum of its proper divisors (83781874).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66819536 is a wasteful number, since it uses less digits than its factorization.

66819536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85251 (or 85238 counting only the distinct ones).

The product of its digits is 233280, while the sum is 44.

The square root of 66819536 is about 8174.3217455640. The cubic root of 66819536 is about 405.7898238357.

The spelling of 66819536 in words is "sixty-six million, eight hundred nineteen thousand, five hundred thirty-six".