66136545 has 24 divisors (see below), whose sum is σ = 121381416. Its totient is φ = 33197568.

The previous prime is 66136541. The next prime is 66136573. The reversal of 66136545 is 54563166.

It can be written as a sum of positive squares in 4 ways, for example, as 4309776 + 61826769 = 2076^2 + 7863^2 .

It is not a de Polignac number, because 66136545 - 2² = 66136541 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66136541) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42462 + ... + 43991.

It is an arithmetic number, because the mean of its divisors is an integer number (5057559).

Almost surely, 2^66136545 is an apocalyptic number.

It is an amenable number.

66136545 is a deficient number, since it is larger than the sum of its proper divisors (55244871).

66136545 is a wasteful number, since it uses less digits than its factorization.

66136545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86481 (or 86478 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 66136545 is about 8132.4378263839. The cubic root of 66136545 is about 404.4025025747.

The spelling of 66136545 in words is "sixty-six million, one hundred thirty-six thousand, five hundred forty-five".