625919669 has 2 divisors, whose sum is σ = 625919670. Its totient is φ = 625919668.

The previous prime is 625919621. The next prime is 625919687. The reversal of 625919669 is 966919526.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 577825444 + 48094225 = 24038^2 + 6935^2 .

It is a cyclic number.

It is not a de Polignac number, because 625919669 - 2²⁸ = 357484213 is a prime.

It is a super-2 number, since 2×625919669² = 783550864082139122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 625919669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (625919699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312959834 + 312959835.

It is an arithmetic number, because the mean of its divisors is an integer number (312959835).

Almost surely, 2^625919669 is an apocalyptic number.

It is an amenable number.

625919669 is a deficient number, since it is larger than the sum of its proper divisors (1).

625919669 is an equidigital number, since it uses as much as digits as its factorization.

625919669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1574640, while the sum is 53.

The square root of 625919669 is about 25018.3866186451. The cubic root of 625919669 is about 855.4071309779.

The spelling of 625919669 in words is "six hundred twenty-five million, nine hundred nineteen thousand, six hundred sixty-nine".