1691663325 has 48 divisors (see below), whose sum is σ = 3055613952. Its totient is φ = 819000000.

The previous prime is 1691663287. The next prime is 1691663327. The reversal of 1691663325 is 5233661961.

It is not a de Polignac number, because 1691663325 - 2¹¹ = 1691661277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1691663327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 866100 + ... + 868050.

It is an arithmetic number, because the mean of its divisors is an integer number (63658624).

Almost surely, 2^1691663325 is an apocalyptic number.

1691663325 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1691663325 is a deficient number, since it is larger than the sum of its proper divisors (1363950627).

1691663325 is a wasteful number, since it uses less digits than its factorization.

1691663325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3026 (or 3021 counting only the distinct ones).

The product of its digits is 174960, while the sum is 42.

The square root of 1691663325 is about 41129.8349741401. The cubic root of 1691663325 is about 1191.5290762188.

The spelling of 1691663325 in words is "one billion, six hundred ninety-one million, six hundred sixty-three thousand, three hundred twenty-five".