16971820403 has 2 divisors, whose sum is σ = 16971820404. Its totient is φ = 16971820402.

The previous prime is 16971820291. The next prime is 16971820421. The reversal of 16971820403 is 30402817961.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16971820403 - 2⁸ = 16971820147 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (16971820493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8485910201 + 8485910202.

It is an arithmetic number, because the mean of its divisors is an integer number (8485910202).

Almost surely, 2^16971820403 is an apocalyptic number.

16971820403 is a deficient number, since it is larger than the sum of its proper divisors (1).

16971820403 is an equidigital number, since it uses as much as digits as its factorization.

16971820403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 41.

The spelling of 16971820403 in words is "sixteen billion, nine hundred seventy-one million, eight hundred twenty thousand, four hundred three".