25533633487 has 2 divisors, whose sum is σ = 25533633488. Its totient is φ = 25533633486.

The previous prime is 25533633449. The next prime is 25533633527. The reversal of 25533633487 is 78433633552.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25533633487 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25533633487.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25533633187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12766816743 + 12766816744.

It is an arithmetic number, because the mean of its divisors is an integer number (12766816744).

Almost surely, 2^25533633487 is an apocalyptic number.

25533633487 is a deficient number, since it is larger than the sum of its proper divisors (1).

25533633487 is an equidigital number, since it uses as much as digits as its factorization.

25533633487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5443200, while the sum is 49.

The spelling of 25533633487 in words is "twenty-five billion, five hundred thirty-three million, six hundred thirty-three thousand, four hundred eighty-seven".