1625999066 has 4 divisors (see below), whose sum is σ = 2438998602. Its totient is φ = 812999532.

The previous prime is 1625998987. The next prime is 1625999083. The reversal of 1625999066 is 6609995261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6609995261 = 1429 ⋅4625609.

It can be written as a sum of positive squares in only one way, i.e., 927507025 + 698492041 = 30455^2 + 26429^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1625998999 and 1625999017.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406499765 + ... + 406499768.

Almost surely, 2^1625999066 is an apocalyptic number.

1625999066 is a deficient number, since it is larger than the sum of its proper divisors (812999536).

1625999066 is an equidigital number, since it uses as much as digits as its factorization.

1625999066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812999535.

The product of its (nonzero) digits is 1574640, while the sum is 53.

The square root of 1625999066 is about 40323.6787260290. The cubic root of 1625999066 is about 1175.9082317866.

The spelling of 1625999066 in words is "one billion, six hundred twenty-five million, nine hundred ninety-nine thousand, sixty-six".