81630154940 has 48 divisors (see below), whose sum is σ = 181886342400. Its totient is φ = 30667133952.

The previous prime is 81630154901. The next prime is 81630154967. The reversal of 81630154940 is 4945103618.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87755 + ... + 413474.

It is an arithmetic number, because the mean of its divisors is an integer number (3789298800).

Almost surely, 2^81630154940 is an apocalyptic number.

It is an amenable number.

81630154940 is an abundant number, since it is smaller than the sum of its proper divisors (100256187460).

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

81630154940 is a wasteful number, since it uses less digits than its factorization.

81630154940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501734 (or 501732 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 41.

The spelling of 81630154940 in words is "eighty-one billion, six hundred thirty million, one hundred fifty-four thousand, nine hundred forty".