1664374192025 has 24 divisors (see below), whose sum is σ = 2096620979544. Its totient is φ = 1310491699200.

The previous prime is 1664374192021. The next prime is 1664374192031. The reversal of 1664374192025 is 5202914734661.

It can be written as a sum of positive squares in 12 ways, for example, as 1459805234176 + 204568957849 = 1208224^2 + 452293^2 .

It is not a de Polignac number, because 1664374192025 - 2² = 1664374192021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1664374192021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1457042 + ... + 2334891.

It is an arithmetic number, because the mean of its divisors is an integer number (87359207481).

Almost surely, 2^{1664374192025} is an apocalyptic number.

It is an amenable number.

1664374192025 is a deficient number, since it is larger than the sum of its proper divisors (432246787519).

1664374192025 is a wasteful number, since it uses less digits than its factorization.

1664374192025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3792221 (or 3792216 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 50.

The spelling of 1664374192025 in words is "one trillion, six hundred sixty-four billion, three hundred seventy-four million, one hundred ninety-two thousand, twenty-five".