81001553050 has 48 divisors (see below), whose sum is σ = 164391076512. Its totient is φ = 29449454400.

The previous prime is 81001552993. The next prime is 81001553069. The reversal of 81001553050 is 5035510018.

It is a super-2 number, since 2×81001553050² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3774952 + ... + 3796348.

It is an arithmetic number, because the mean of its divisors is an integer number (3424814094).

Almost surely, 2^81001553050 is an apocalyptic number.

81001553050 is an abundant number, since it is smaller than the sum of its proper divisors (83389523462).

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

81001553050 is a wasteful number, since it uses less digits than its factorization.

81001553050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28303 (or 28298 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 28.

The spelling of 81001553050 in words is "eighty-one billion, one million, five hundred fifty-three thousand, fifty".