1663626407 has 2 divisors, whose sum is σ = 1663626408. Its totient is φ = 1663626406.

The previous prime is 1663626361. The next prime is 1663626413. The reversal of 1663626407 is 7046263661.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1663626407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1663626427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831813203 + 831813204.

It is an arithmetic number, because the mean of its divisors is an integer number (831813204).

Almost surely, 2^1663626407 is an apocalyptic number.

1663626407 is a deficient number, since it is larger than the sum of its proper divisors (1).

1663626407 is an equidigital number, since it uses as much as digits as its factorization.

1663626407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 41.

The square root of 1663626407 is about 40787.5766257325. The cubic root of 1663626407 is about 1184.9097374084.

The spelling of 1663626407 in words is "one billion, six hundred sixty-three million, six hundred twenty-six thousand, four hundred seven".