66971503 has 2 divisors, whose sum is σ = 66971504. Its totient is φ = 66971502.

The previous prime is 66971479. The next prime is 66971507. The reversal of 66971503 is 30517966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66971503 - 2¹³ = 66963311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66971507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33485751 + 33485752.

It is an arithmetic number, because the mean of its divisors is an integer number (33485752).

Almost surely, 2^66971503 is an apocalyptic number.

66971503 is a deficient number, since it is larger than the sum of its proper divisors (1).

66971503 is an equidigital number, since it uses as much as digits as its factorization.

66971503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 66971503 is about 8183.6118554096. The cubic root of 66971503 is about 406.0972188259.

The spelling of 66971503 in words is "sixty-six million, nine hundred seventy-one thousand, five hundred three".