1625065261 has 4 divisors (see below), whose sum is σ = 1652608800. Its totient is φ = 1597521724.

The previous prime is 1625065259. The next prime is 1625065301. The reversal of 1625065261 is 1625605261.

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.

It is a cyclic number.

It is not a de Polignac number, because 1625065261 - 2¹ = 1625065259 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 (1625065361) 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, 13771681 + ... + 13771798.

It is an arithmetic number, because the mean of its divisors is an integer number (413152200).

Almost surely, 2^1625065261 is an apocalyptic number.

It is an amenable number.

1625065261 is a deficient number, since it is larger than the sum of its proper divisors (27543539).

1625065261 is an equidigital number, since it uses as much as digits as its factorization.

1625065261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27543538.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 1625065261 is about 40312.0981964472. The cubic root of 1625065261 is about 1175.6830821577.

The spelling of 1625065261 in words is "one billion, six hundred twenty-five million, sixty-five thousand, two hundred sixty-one".