66958403 has 2 divisors, whose sum is σ = 66958404. Its totient is φ = 66958402.

The previous prime is 66958391. The next prime is 66958429. The reversal of 66958403 is 30485966.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66958403 - 2⁴ = 66958387 is a prime.

It is not a weakly prime, because it can be changed into another prime (66958433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33479201 + 33479202.

It is an arithmetic number, because the mean of its divisors is an integer number (33479202).

Almost surely, 2^66958403 is an apocalyptic number.

66958403 is a deficient number, since it is larger than the sum of its proper divisors (1).

66958403 is an equidigital number, since it uses as much as digits as its factorization.

66958403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 66958403 is about 8182.8114361752. The cubic root of 66958403 is about 406.0707388046.

The spelling of 66958403 in words is "sixty-six million, nine hundred fifty-eight thousand, four hundred three".