81213349603 has 8 divisors (see below), whose sum is σ = 87613070688. Its totient is φ = 74993902464.

The previous prime is 81213349589. The next prime is 81213349621. The reversal of 81213349603 is 30694331218.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81213349603 - 2¹³ = 81213341411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81213349103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45067551 + ... + 45069352.

It is an arithmetic number, because the mean of its divisors is an integer number (10951633836).

Almost surely, 2^81213349603 is an apocalyptic number.

81213349603 is a deficient number, since it is larger than the sum of its proper divisors (6399721085).

81213349603 is a wasteful number, since it uses less digits than its factorization.

81213349603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90136973.

The product of its (nonzero) digits is 93312, while the sum is 40.

The spelling of 81213349603 in words is "eighty-one billion, two hundred thirteen million, three hundred forty-nine thousand, six hundred three".