81695219962128 has 40 divisors (see below), whose sum is σ = 212390226863808. Its totient is φ = 27058289411712.

The previous prime is 81695219962087. The next prime is 81695219962163. The reversal of 81695219962128 is 82126991259618.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5420322876 + ... + 5420337947.

Almost surely, 2^{81695219962128} is an apocalyptic number.

It is an amenable number.

81695219962128 is an abundant number, since it is smaller than the sum of its proper divisors (130695006901680).

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

81695219962128 is a wasteful number, since it uses less digits than its factorization.

81695219962128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10840660991 (or 10840660985 counting only the distinct ones).

The product of its digits is 67184640, while the sum is 69.

The spelling of 81695219962128 in words is "eighty-one trillion, six hundred ninety-five billion, two hundred nineteen million, nine hundred sixty-two thousand, one hundred twenty-eight".