81111950279794 has 128 divisors (see below), whose sum is σ = 147997456588800. Its totient is φ = 32567963258880.

The previous prime is 81111950279771. The next prime is 81111950279803. The reversal of 81111950279794 is 49797205911118.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 16958381527 + ... + 16958386309.

It is an arithmetic number, because the mean of its divisors is an integer number (1156230129600).

Almost surely, 2^{81111950279794} is an apocalyptic number.

81111950279794 is a deficient number, since it is larger than the sum of its proper divisors (66885506309006).

81111950279794 is a wasteful number, since it uses less digits than its factorization.

81111950279794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6648.

The product of its (nonzero) digits is 11430720, while the sum is 64.

The spelling of 81111950279794 in words is "eighty-one trillion, one hundred eleven billion, nine hundred fifty million, two hundred seventy-nine thousand, seven hundred ninety-four".