1630111645 has 4 divisors (see below), whose sum is σ = 1956133980. Its totient is φ = 1304089312.

The previous prime is 1630111633. The next prime is 1630111667. The reversal of 1630111645 is 5461110361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5461110361 = 7 ⋅780158623.

It can be written as a sum of positive squares in 2 ways, for example, as 201725209 + 1428386436 = 14203^2 + 37794^2 .

It is a cyclic number.

It is not a de Polignac number, because 1630111645 - 2¹⁹ = 1629587357 is a prime.

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, 163011160 + ... + 163011169.

It is an arithmetic number, because the mean of its divisors is an integer number (489033495).

Almost surely, 2^1630111645 is an apocalyptic number.

It is an amenable number.

1630111645 is a deficient number, since it is larger than the sum of its proper divisors (326022335).

1630111645 is an equidigital number, since it uses as much as digits as its factorization.

1630111645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326022334.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 1630111645 is about 40374.6411129560. The cubic root of 1630111645 is about 1176.8987907883.

The spelling of 1630111645 in words is "one billion, six hundred thirty million, one hundred eleven thousand, six hundred forty-five".