81037485616 has 10 divisors (see below), whose sum is σ = 157010128412. Its totient is φ = 40518742800.

The previous prime is 81037485601. The next prime is 81037485619. The reversal of 81037485616 is 61658473018.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 81037485616.

It is not an unprimeable number, because it can be changed into a prime (81037485619) 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 as a sum of consecutive naturals, namely, 2532421410 + ... + 2532421441.

Almost surely, 2^81037485616 is an apocalyptic number.

It is an amenable number.

81037485616 is a deficient number, since it is larger than the sum of its proper divisors (75972642796).

81037485616 is a wasteful number, since it uses less digits than its factorization.

81037485616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5064842859 (or 5064842853 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 49.

The spelling of 81037485616 in words is "eighty-one billion, thirty-seven million, four hundred eighty-five thousand, six hundred sixteen".