66977503 has 4 divisors (see below), whose sum is σ = 67226760. Its totient is φ = 66728248.

The previous prime is 66977497. The next prime is 66977509. The reversal of 66977503 is 30577966.

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

It is an interprime number because it is at equal distance from previous prime (66977497) and next prime (66977509).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66977503 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66977503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66977509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124225 + ... + 124762.

It is an arithmetic number, because the mean of its divisors is an integer number (16806690).

Almost surely, 2^66977503 is an apocalyptic number.

66977503 is a deficient number, since it is larger than the sum of its proper divisors (249257).

66977503 is a wasteful number, since it uses less digits than its factorization.

66977503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249256.

The product of its (nonzero) digits is 238140, while the sum is 43.

The square root of 66977503 is about 8183.9784335004. The cubic root of 66977503 is about 406.1093459269.

The spelling of 66977503 in words is "sixty-six million, nine hundred seventy-seven thousand, five hundred three".