25220515049 has 2 divisors, whose sum is σ = 25220515050. Its totient is φ = 25220515048.

The previous prime is 25220515009. The next prime is 25220515069. The reversal of 25220515049 is 94051502252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16095489424 + 9125025625 = 126868^2 + 95525^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25220515049 is a prime.

It is a super-3 number, since 3×25220515049³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (25220515009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12610257524 + 12610257525.

It is an arithmetic number, because the mean of its divisors is an integer number (12610257525).

Almost surely, 2^25220515049 is an apocalyptic number.

It is an amenable number.

25220515049 is a deficient number, since it is larger than the sum of its proper divisors (1).

25220515049 is an equidigital number, since it uses as much as digits as its factorization.

25220515049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36000, while the sum is 35.

The spelling of 25220515049 in words is "twenty-five billion, two hundred twenty million, five hundred fifteen thousand, forty-nine".