81305203502 has 16 divisors (see below), whose sum is σ = 122753588832. Its totient is φ = 40387600800.

The previous prime is 81305203477. The next prime is 81305203513. The reversal of 81305203502 is 20530250318.

It is a super-2 number, since 2×81305203502² (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 7 ways as a sum of consecutive naturals, for example, 570908 + ... + 698960.

It is an arithmetic number, because the mean of its divisors is an integer number (7672099302).

Almost surely, 2^81305203502 is an apocalyptic number.

81305203502 is a deficient number, since it is larger than the sum of its proper divisors (41448385330).

81305203502 is a wasteful number, since it uses less digits than its factorization.

81305203502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130123.

The product of its (nonzero) digits is 7200, while the sum is 29.

The spelling of 81305203502 in words is "eighty-one billion, three hundred five million, two hundred three thousand, five hundred two".