625381878089 has 2 divisors, whose sum is σ = 625381878090. Its totient is φ = 625381878088.

The previous prime is 625381878071. The next prime is 625381878133. The reversal of 625381878089 is 980878183526.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 606093390400 + 19288487689 = 778520^2 + 138883^2 .

It is a cyclic number.

It is not a de Polignac number, because 625381878089 - 2²⁴ = 625365100873 is a prime.

It is a super-2 number, since 2×625381878089² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (625381878029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312690939044 + 312690939045.

It is an arithmetic number, because the mean of its divisors is an integer number (312690939045).

Almost surely, 2^625381878089 is an apocalyptic number.

It is an amenable number.

625381878089 is a deficient number, since it is larger than the sum of its proper divisors (1).

625381878089 is an equidigital number, since it uses as much as digits as its factorization.

625381878089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46448640, while the sum is 65.

The spelling of 625381878089 in words is "six hundred twenty-five billion, three hundred eighty-one million, eight hundred seventy-eight thousand, eighty-nine".