81451444050670 has 32 divisors (see below), whose sum is σ = 154331577108000. Its totient is φ = 30865305332736.

The previous prime is 81451444050619. The next prime is 81451444050677. The reversal of 81451444050670 is 7605044415418.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81451444050677) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8238406 + ... + 15191254.

It is an arithmetic number, because the mean of its divisors is an integer number (4822861784625).

Almost surely, 2^{81451444050670} is an apocalyptic number.

81451444050670 is a deficient number, since it is larger than the sum of its proper divisors (72880133057330).

81451444050670 is a wasteful number, since it uses less digits than its factorization.

81451444050670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7014532.

The product of its (nonzero) digits is 2150400, while the sum is 49.

The spelling of 81451444050670 in words is "eighty-one trillion, four hundred fifty-one billion, four hundred forty-four million, fifty thousand, six hundred seventy".