1625641453 has 4 divisors (see below), whose sum is σ = 1647910588. Its totient is φ = 1603372320.

The previous prime is 1625641447. The next prime is 1625641471. The reversal of 1625641453 is 3541465261.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1422949284 + 202692169 = 37722^2 + 14237^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1625641453 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 (1625641483) 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, 11134458 + ... + 11134603.

It is an arithmetic number, because the mean of its divisors is an integer number (411977647).

Almost surely, 2^1625641453 is an apocalyptic number.

It is an amenable number.

1625641453 is a deficient number, since it is larger than the sum of its proper divisors (22269135).

1625641453 is an equidigital number, since it uses as much as digits as its factorization.

1625641453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22269134.

The product of its digits is 86400, while the sum is 37.

The square root of 1625641453 is about 40319.2442017456. The cubic root of 1625641453 is about 1175.8220179398.

The spelling of 1625641453 in words is "one billion, six hundred twenty-five million, six hundred forty-one thousand, four hundred fifty-three".