81975402106 has 16 divisors (see below), whose sum is σ = 133087248000. Its totient is φ = 37644673968.

The previous prime is 81975402097. The next prime is 81975402107. The reversal of 81975402106 is 60120457918.

It is a super-3 number, since 3×81975402106³ (a number of 34 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (81975402107) 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, 7916686 + ... + 7927033.

It is an arithmetic number, because the mean of its divisors is an integer number (8317953000).

Almost surely, 2^81975402106 is an apocalyptic number.

81975402106 is a deficient number, since it is larger than the sum of its proper divisors (51111845894).

81975402106 is a wasteful number, since it uses less digits than its factorization.

81975402106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15843933.

The product of its (nonzero) digits is 120960, while the sum is 43.

The spelling of 81975402106 in words is "eighty-one billion, nine hundred seventy-five million, four hundred two thousand, one hundred six".