1671623725 has 6 divisors (see below), whose sum is σ = 2072813450. Its totient is φ = 1337298960.

The previous prime is 1671623689. The next prime is 1671623749. The reversal of 1671623725 is 5273261761.

It can be written as a sum of positive squares in 3 ways, for example, as 18957316 + 1652666409 = 4354^2 + 40653^2 .

It is not a de Polignac number, because 1671623725 - 2¹⁵ = 1671590957 is a prime.

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, 33432450 + ... + 33432499.

Almost surely, 2^1671623725 is an apocalyptic number.

It is an amenable number.

1671623725 is a deficient number, since it is larger than the sum of its proper divisors (401189725).

1671623725 is an equidigital number, since it uses as much as digits as its factorization.

1671623725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66864959 (or 66864954 counting only the distinct ones).

The product of its digits is 105840, while the sum is 40.

The square root of 1671623725 is about 40885.4952886718. The cubic root of 1671623725 is about 1186.8053865715.

The spelling of 1671623725 in words is "one billion, six hundred seventy-one million, six hundred twenty-three thousand, seven hundred twenty-five".