25403573989 has 2 divisors, whose sum is σ = 25403573990. Its totient is φ = 25403573988.

The previous prime is 25403573983. The next prime is 25403574029. The reversal of 25403573989 is 98937530452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13274957089 + 12128616900 = 115217^2 + 110130^2 .

It is a cyclic number.

It is not a de Polignac number, because 25403573989 - 2³ = 25403573981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25403573981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12701786994 + 12701786995.

It is an arithmetic number, because the mean of its divisors is an integer number (12701786995).

Almost surely, 2^25403573989 is an apocalyptic number.

It is an amenable number.

25403573989 is a deficient number, since it is larger than the sum of its proper divisors (1).

25403573989 is an equidigital number, since it uses as much as digits as its factorization.

25403573989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8164800, while the sum is 55.

The spelling of 25403573989 in words is "twenty-five billion, four hundred three million, five hundred seventy-three thousand, nine hundred eighty-nine".