25430066531 has 4 divisors (see below), whose sum is σ = 25430412000. Its totient is φ = 25429721064.

The previous prime is 25430066527. The next prime is 25430066533. The reversal of 25430066531 is 13566003452.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 25430066531 - 2² = 25430066527 is a prime.

It is a super-2 number, since 2×25430066531² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25430066491 and 25430066500.

It is not an unprimeable number, because it can be changed into a prime (25430066533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13211 + ... + 225908.

It is an arithmetic number, because the mean of its divisors is an integer number (6357603000).

Almost surely, 2^25430066531 is an apocalyptic number.

25430066531 is a deficient number, since it is larger than the sum of its proper divisors (345469).

25430066531 is a wasteful number, since it uses less digits than its factorization.

25430066531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345468.

The product of its (nonzero) digits is 64800, while the sum is 35.

Adding to 25430066531 its reverse (13566003452), we get a palindrome (38996069983).

The spelling of 25430066531 in words is "twenty-five billion, four hundred thirty million, sixty-six thousand, five hundred thirty-one".