106581449070721 has 4 divisors (see below), whose sum is σ = 110256671452500. Its totient is φ = 102906226688944.

The previous prime is 106581449070631. The next prime is 106581449070731. The reversal of 106581449070721 is 127070944185601.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 43234096669696 + 63347352401025 = 6575264^2 + 7959105^2 .

It is a cyclic number.

It is not a de Polignac number, because 106581449070721 - 2²¹ = 106581446973569 is a prime.

It is a super-2 number, since 2×106581449070721² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (106581449070731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1837611190846 + ... + 1837611190903.

It is an arithmetic number, because the mean of its divisors is an integer number (27564167863125).

Almost surely, 2^{106581449070721} is an apocalyptic number.

It is an amenable number.

106581449070721 is a deficient number, since it is larger than the sum of its proper divisors (3675222381779).

106581449070721 is an equidigital number, since it uses as much as digits as its factorization.

106581449070721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3675222381778.

The product of its (nonzero) digits is 3386880, while the sum is 55.

The spelling of 106581449070721 in words is "one hundred six trillion, five hundred eighty-one billion, four hundred forty-nine million, seventy thousand, seven hundred twenty-one".