81715070448442 has 16 divisors (see below), whose sum is σ = 122869851834240. Its totient is φ = 40758499881792.

The previous prime is 81715070448397. The next prime is 81715070448527. The reversal of 81715070448442 is 24484407051718.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8176383 + ... + 15175090.

It is an arithmetic number, because the mean of its divisors is an integer number (7679365739640).

Almost surely, 2^{81715070448442} is an apocalyptic number.

81715070448442 is a deficient number, since it is larger than the sum of its proper divisors (41154781385798).

81715070448442 is a wasteful number, since it uses less digits than its factorization.

81715070448442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23355717.

The product of its (nonzero) digits is 8028160, while the sum is 55.

The spelling of 81715070448442 in words is "eighty-one trillion, seven hundred fifteen billion, seventy million, four hundred forty-eight thousand, four hundred forty-two".