81617760106 has 8 divisors (see below), whose sum is σ = 122667165540. Its totient is φ = 40728704928.

The previous prime is 81617760097. The next prime is 81617760127. The reversal of 81617760106 is 60106771618.

It can be written as a sum of positive squares in 2 ways, for example, as 80222065225 + 1395694881 = 283235^2 + 37359^2 .

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

It is a super-2 number, since 2×81617760106² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40086291 + ... + 40088326.

Almost surely, 2^81617760106 is an apocalyptic number.

81617760106 is a deficient number, since it is larger than the sum of its proper divisors (41049405434).

81617760106 is a wasteful number, since it uses less digits than its factorization.

81617760106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80175128.

The product of its (nonzero) digits is 84672, while the sum is 43.

The spelling of 81617760106 in words is "eighty-one billion, six hundred seventeen million, seven hundred sixty thousand, one hundred six".