81772503030078 has 32 divisors (see below), whose sum is σ = 186909880078080. Its totient is φ = 23363409578880.

The previous prime is 81772503030073. The next prime is 81772503030079. The reversal of 81772503030078 is 87003030527718.

It is a self number, because there is not a number n which added to its sum of digits gives 81772503030078.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81772503030073) 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, 611403 + ... + 12803078.

It is an arithmetic number, because the mean of its divisors is an integer number (5840933752440).

Almost surely, 2^{81772503030078} is an apocalyptic number.

81772503030078 is an abundant number, since it is smaller than the sum of its proper divisors (105137377048002).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81772503030078 is a wasteful number, since it uses less digits than its factorization.

81772503030078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13559632.

The product of its (nonzero) digits is 1975680, while the sum is 51.

The spelling of 81772503030078 in words is "eighty-one trillion, seven hundred seventy-two billion, five hundred three million, thirty thousand, seventy-eight".