1625455537 has 4 divisors (see below), whose sum is σ = 1665100836. Its totient is φ = 1585810240.

The previous prime is 1625455501. The next prime is 1625455541. The reversal of 1625455537 is 7355545261.

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 782656576 + 842798961 = 27976^2 + 29031^2 .

It is a cyclic number.

It is not a de Polignac number, because 1625455537 - 2⁷ = 1625455409 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1625455493 and 1625455502.

It is not an unprimeable number, because it can be changed into a prime (1625455037) 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, 19822588 + ... + 19822669.

It is an arithmetic number, because the mean of its divisors is an integer number (416275209).

Almost surely, 2^1625455537 is an apocalyptic number.

It is an amenable number.

1625455537 is a deficient number, since it is larger than the sum of its proper divisors (39645299).

1625455537 is an equidigital number, since it uses as much as digits as its factorization.

1625455537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39645298.

The product of its digits is 630000, while the sum is 43.

The square root of 1625455537 is about 40316.9385866536. The cubic root of 1625455537 is about 1175.7771920528. Note that the first 3 decimals are identical.

The spelling of 1625455537 in words is "one billion, six hundred twenty-five million, four hundred fifty-five thousand, five hundred thirty-seven".