1663025365 has 4 divisors (see below), whose sum is σ = 1995630444. Its totient is φ = 1330420288.

The previous prime is 1663025321. The next prime is 1663025417. The reversal of 1663025365 is 5635203661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 417711844 + 1245313521 = 20438^2 + 35289^2 .

It is a cyclic number.

It is not a de Polignac number, because 1663025365 - 2⁷ = 1663025237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166302532 + ... + 166302541.

It is an arithmetic number, because the mean of its divisors is an integer number (498907611).

Almost surely, 2^1663025365 is an apocalyptic number.

It is an amenable number.

1663025365 is a deficient number, since it is larger than the sum of its proper divisors (332605079).

1663025365 is an equidigital number, since it uses as much as digits as its factorization.

1663025365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332605078.

The product of its (nonzero) digits is 97200, while the sum is 37.

The square root of 1663025365 is about 40780.2080058452. The cubic root of 1663025365 is about 1184.7670238162.

The spelling of 1663025365 in words is "one billion, six hundred sixty-three million, twenty-five thousand, three hundred sixty-five".