1625688523 has 4 divisors (see below), whose sum is σ = 1630118560. Its totient is φ = 1621258488.

The previous prime is 1625688521. The next prime is 1625688527. The reversal of 1625688523 is 3258865261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3258865261 = 79 ⋅41251459.

It is a cyclic number.

It is not a de Polignac number, because 1625688523 - 2¹ = 1625688521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1625688521) 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, 2214468 + ... + 2215201.

It is an arithmetic number, because the mean of its divisors is an integer number (407529640).

Almost surely, 2^1625688523 is an apocalyptic number.

1625688523 is a deficient number, since it is larger than the sum of its proper divisors (4430037).

1625688523 is an equidigital number, since it uses as much as digits as its factorization.

1625688523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4430036.

The product of its digits is 691200, while the sum is 46.

The square root of 1625688523 is about 40319.8279138193. The cubic root of 1625688523 is about 1175.8333663644.

The spelling of 1625688523 in words is "one billion, six hundred twenty-five million, six hundred eighty-eight thousand, five hundred twenty-three".