25158198649 has 2 divisors, whose sum is σ = 25158198650. Its totient is φ = 25158198648.

The previous prime is 25158198643. The next prime is 25158198677. The reversal of 25158198649 is 94689185152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22594599225 + 2563599424 = 150315^2 + 50632^2 .

It is a cyclic number.

It is not a de Polignac number, because 25158198649 - 2¹¹ = 25158196601 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25158198593 and 25158198602.

It is not a weakly prime, because it can be changed into another prime (25158198643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12579099324 + 12579099325.

It is an arithmetic number, because the mean of its divisors is an integer number (12579099325).

Almost surely, 2^25158198649 is an apocalyptic number.

It is an amenable number.

25158198649 is a deficient number, since it is larger than the sum of its proper divisors (1).

25158198649 is an equidigital number, since it uses as much as digits as its factorization.

25158198649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6220800, while the sum is 58.

The spelling of 25158198649 in words is "twenty-five billion, one hundred fifty-eight million, one hundred ninety-eight thousand, six hundred forty-nine".