1819664325 has 96 divisors (see below), whose sum is σ = 3472634880. Its totient is φ = 933508800.

The previous prime is 1819664321. The next prime is 1819664339. The reversal of 1819664325 is 5234669181.

1819664325 is a `hidden beast` number, since 181 + 96 + 64 + 325 = 666.

It is not a de Polignac number, because 1819664325 - 2² = 1819664321 is a prime.

It is a super-2 number, since 2×1819664325² = 6622356511355411250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1819664321) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2060334 + ... + 2061216.

It is an arithmetic number, because the mean of its divisors is an integer number (36173280).

Almost surely, 2^1819664325 is an apocalyptic number.

1819664325 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1819664325 is a deficient number, since it is larger than the sum of its proper divisors (1652970555).

1819664325 is a wasteful number, since it uses less digits than its factorization.

1819664325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1016 (or 1005 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 1819664325 is about 42657.5236623037. The cubic root of 1819664325 is about 1220.8540837045.

The spelling of 1819664325 in words is "one billion, eight hundred nineteen million, six hundred sixty-four thousand, three hundred twenty-five".