1671564325 has 6 divisors (see below), whose sum is σ = 2072739794. Its totient is φ = 1337251440.

The previous prime is 1671564319. The next prime is 1671564331. The reversal of 1671564325 is 5234651761.

It is an interprime number because it is at equal distance from previous prime (1671564319) and next prime (1671564331).

It can be written as a sum of positive squares in 3 ways, for example, as 1779556 + 1669784769 = 1334^2 + 40863^2 .

It is not a de Polignac number, because 1671564325 - 2²⁷ = 1537346597 is a prime.

It is a super-2 number, since 2×1671564325² = 5588254585225411250, which contains 22 as substring.

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 5 ways as a sum of consecutive naturals, for example, 33431262 + ... + 33431311.

Almost surely, 2^1671564325 is an apocalyptic number.

It is an amenable number.

1671564325 is a deficient number, since it is larger than the sum of its proper divisors (401175469).

1671564325 is an equidigital number, since it uses as much as digits as its factorization.

1671564325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66862583 (or 66862578 counting only the distinct ones).

The product of its digits is 151200, while the sum is 40.

The square root of 1671564325 is about 40884.7688632332. The cubic root of 1671564325 is about 1186.7913289671.

The spelling of 1671564325 in words is "one billion, six hundred seventy-one million, five hundred sixty-four thousand, three hundred twenty-five".