81630333126 has 24 divisors (see below), whose sum is σ = 177032460384. Its totient is φ = 27184458960.

The previous prime is 81630333119. The next prime is 81630333133. The reversal of 81630333126 is 62133303618.

81630333126 is a `hidden beast` number, since 8 + 1 + 630 + 3 + 3 + 3 + 12 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (81630333119) and next prime (81630333133).

It is a super-2 number, since 2×81630333126² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2118046 + ... + 2156241.

It is an arithmetic number, because the mean of its divisors is an integer number (7376352516).

Almost surely, 2^81630333126 is an apocalyptic number.

81630333126 is an abundant number, since it is smaller than the sum of its proper divisors (95402127258).

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

81630333126 is a wasteful number, since it uses less digits than its factorization.

81630333126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4275356 (or 4275353 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 36.

The spelling of 81630333126 in words is "eighty-one billion, six hundred thirty million, three hundred thirty-three thousand, one hundred twenty-six".