1966402499 has 2 divisors, whose sum is σ = 1966402500. Its totient is φ = 1966402498.

The previous prime is 1966402489. The next prime is 1966402519. The reversal of 1966402499 is 9942046691.

It is a weak prime.

It is an emirp because it is prime and its reverse (9942046691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1966402499 - 2¹² = 1966398403 is a prime.

It is not a weakly prime, because it can be changed into another prime (1966402409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 983201249 + 983201250.

It is an arithmetic number, because the mean of its divisors is an integer number (983201250).

Almost surely, 2^1966402499 is an apocalyptic number.

1966402499 is a deficient number, since it is larger than the sum of its proper divisors (1).

1966402499 is an equidigital number, since it uses as much as digits as its factorization.

1966402499 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 839808, while the sum is 50.

The square root of 1966402499 is about 44344.1371434827. The cubic root of 1966402499 is about 1252.8261386568.

The spelling of 1966402499 in words is "one billion, nine hundred sixty-six million, four hundred two thousand, four hundred ninety-nine".