81698053003 has 64 divisors (see below), whose sum is σ = 101874769920. Its totient is φ = 64008983808.

The previous prime is 81698052977. The next prime is 81698053007. The reversal of 81698053003 is 30035089618.

It is not a de Polignac number, because 81698053003 - 2²¹ = 81695955851 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is not an unprimeable number, because it can be changed into a prime (81698053007) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 70247100 + ... + 70248262.

It is an arithmetic number, because the mean of its divisors is an integer number (1591793280).

Almost surely, 2^81698053003 is an apocalyptic number.

81698053003 is a deficient number, since it is larger than the sum of its proper divisors (20176716917).

81698053003 is a wasteful number, since it uses less digits than its factorization.

81698053003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1448.

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 81698053003 in words is "eighty-one billion, six hundred ninety-eight million, fifty-three thousand, three".