1461821663 has 2 divisors, whose sum is σ = 1461821664. Its totient is φ = 1461821662.

The previous prime is 1461821659. The next prime is 1461821671. The reversal of 1461821663 is 3661281641.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1461821663 - 2² = 1461821659 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1461821693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 730910831 + 730910832.

It is an arithmetic number, because the mean of its divisors is an integer number (730910832).

Almost surely, 2^1461821663 is an apocalyptic number.

1461821663 is a deficient number, since it is larger than the sum of its proper divisors (1).

1461821663 is an equidigital number, since it uses as much as digits as its factorization.

1461821663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 38.

The square root of 1461821663 is about 38233.7764679347. The cubic root of 1461821663 is about 1134.9188199683.

The spelling of 1461821663 in words is "one billion, four hundred sixty-one million, eight hundred twenty-one thousand, six hundred sixty-three".