3663473621 has 2 divisors, whose sum is σ = 3663473622. Its totient is φ = 3663473620.

The previous prime is 3663473587. The next prime is 3663473641. The reversal of 3663473621 is 1263743663.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3518150596 + 145323025 = 59314^2 + 12055^2 .

It is a cyclic number.

It is not a de Polignac number, because 3663473621 - 2³⁰ = 2589731797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3663473641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1831736810 + 1831736811.

It is an arithmetic number, because the mean of its divisors is an integer number (1831736811).

Almost surely, 2^3663473621 is an apocalyptic number.

It is an amenable number.

3663473621 is a deficient number, since it is larger than the sum of its proper divisors (1).

3663473621 is an equidigital number, since it uses as much as digits as its factorization.

3663473621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 41.

The square root of 3663473621 is about 60526.6356325874. The cubic root of 3663473621 is about 1541.5739264956.

The spelling of 3663473621 in words is "three billion, six hundred sixty-three million, four hundred seventy-three thousand, six hundred twenty-one".