25536507551 has 16 divisors (see below), whose sum is σ = 28223520768. Its totient is φ = 22981833600.

The previous prime is 25536507533. The next prime is 25536507559. The reversal of 25536507551 is 15570563552.

It is a cyclic number.

It is not a de Polignac number, because 25536507551 - 2¹⁸ = 25536245407 is a prime.

It is a super-2 number, since 2×25536507551² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25536507559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1426466 + ... + 1444256.

It is an arithmetic number, because the mean of its divisors is an integer number (1763970048).

Almost surely, 2^25536507551 is an apocalyptic number.

25536507551 is a deficient number, since it is larger than the sum of its proper divisors (2687013217).

25536507551 is a wasteful number, since it uses less digits than its factorization.

25536507551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21502.

The product of its (nonzero) digits is 787500, while the sum is 44.

The spelling of 25536507551 in words is "twenty-five billion, five hundred thirty-six million, five hundred seven thousand, five hundred fifty-one".