66136503 has 4 divisors (see below), whose sum is σ = 88182008. Its totient is φ = 44091000.

The previous prime is 66136487. The next prime is 66136507. The reversal of 66136503 is 30563166.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 66136503 - 2⁴ = 66136487 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 (66136507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11022748 + ... + 11022753.

It is an arithmetic number, because the mean of its divisors is an integer number (22045502).

Almost surely, 2^66136503 is an apocalyptic number.

66136503 is a deficient number, since it is larger than the sum of its proper divisors (22045505).

66136503 is a wasteful number, since it uses less digits than its factorization.

66136503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22045504.

The product of its (nonzero) digits is 9720, while the sum is 30.

The square root of 66136503 is about 8132.4352441320. The cubic root of 66136503 is about 404.4024169695.

Adding to 66136503 its reverse (30563166), we get a palindrome (96699669).

The spelling of 66136503 in words is "sixty-six million, one hundred thirty-six thousand, five hundred three".