25000549481 has 2 divisors, whose sum is σ = 25000549482. Its totient is φ = 25000549480.

The previous prime is 25000549423. The next prime is 25000549583. The reversal of 25000549481 is 18494500052.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24864243856 + 136305625 = 157684^2 + 11675^2 .

It is a cyclic number.

It is not a de Polignac number, because 25000549481 - 2⁶ = 25000549417 is a prime.

It is a super-2 number, since 2×25000549481² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25000549381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12500274740 + 12500274741.

It is an arithmetic number, because the mean of its divisors is an integer number (12500274741).

Almost surely, 2^25000549481 is an apocalyptic number.

It is an amenable number.

25000549481 is a deficient number, since it is larger than the sum of its proper divisors (1).

25000549481 is an equidigital number, since it uses as much as digits as its factorization.

25000549481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 57600, while the sum is 38.

The spelling of 25000549481 in words is "twenty-five billion, five hundred forty-nine thousand, four hundred eighty-one".