1625689677 has 4 divisors (see below), whose sum is σ = 2167586240. Its totient is φ = 1083793116.

The previous prime is 1625689673. The next prime is 1625689679. The reversal of 1625689677 is 7769865261.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7769865261 = 3 ⋅2589955087.

It is not a de Polignac number, because 1625689677 - 2² = 1625689673 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1625689673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 270948277 + ... + 270948282.

It is an arithmetic number, because the mean of its divisors is an integer number (541896560).

Almost surely, 2^1625689677 is an apocalyptic number.

It is an amenable number.

1625689677 is a deficient number, since it is larger than the sum of its proper divisors (541896563).

1625689677 is an equidigital number, since it uses as much as digits as its factorization.

1625689677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541896562.

The product of its digits is 7620480, while the sum is 57.

The square root of 1625689677 is about 40319.8422243937. The cubic root of 1625689677 is about 1175.8336445873.

The spelling of 1625689677 in words is "one billion, six hundred twenty-five million, six hundred eighty-nine thousand, six hundred seventy-seven".