81415943061 has 8 divisors (see below), whose sum is σ = 108627305760. Its totient is φ = 54240937872.

The previous prime is 81415943009. The next prime is 81415943071. The reversal of 81415943061 is 16034951418.

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

It is not a de Polignac number, because 81415943061 - 2¹⁷ = 81415811989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81415943071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9084151 + ... + 9093108.

It is an arithmetic number, because the mean of its divisors is an integer number (13578413220).

Almost surely, 2^81415943061 is an apocalyptic number.

It is an amenable number.

81415943061 is a deficient number, since it is larger than the sum of its proper divisors (27211362699).

81415943061 is a wasteful number, since it uses less digits than its factorization.

81415943061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18178755.

The product of its (nonzero) digits is 103680, while the sum is 42.

The spelling of 81415943061 in words is "eighty-one billion, four hundred fifteen million, nine hundred forty-three thousand, sixty-one".