26631531630 has 96 divisors (see below), whose sum is σ = 76018277088. Its totient is φ = 6414969600.

The previous prime is 26631531587. The next prime is 26631531643. The reversal of 26631531630 is 3613513662.

26631531630 is a `hidden beast` number, since 2 + 6 + 6 + 3 + 15 + 3 + 1 + 630 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 69760 + ... + 241100.

It is an arithmetic number, because the mean of its divisors is an integer number (791857053).

Almost surely, 2^26631531630 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26631531630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38009138544).

26631531630 is an abundant number, since it is smaller than the sum of its proper divisors (49386745458).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26631531630 is a wasteful number, since it uses less digits than its factorization.

26631531630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171522 (or 171519 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 36.

The spelling of 26631531630 in words is "twenty-six billion, six hundred thirty-one million, five hundred thirty-one thousand, six hundred thirty".