81548025797 has 16 divisors (see below), whose sum is σ = 97286264832. Its totient is φ = 66834195120.

The previous prime is 81548025763. The next prime is 81548025833. The reversal of 81548025797 is 79752084518.

It is not a de Polignac number, because 81548025797 - 2¹⁶ = 81547960261 is a prime.

It is a super-2 number, since 2×81548025797² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81548024797) 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, 342272 + ... + 529382.

It is an arithmetic number, because the mean of its divisors is an integer number (6080391552).

Almost surely, 2^81548025797 is an apocalyptic number.

It is an amenable number.

81548025797 is a deficient number, since it is larger than the sum of its proper divisors (15738239035).

81548025797 is a wasteful number, since it uses less digits than its factorization.

81548025797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189848.

The product of its (nonzero) digits is 5644800, while the sum is 56.

The spelling of 81548025797 in words is "eighty-one billion, five hundred forty-eight million, twenty-five thousand, seven hundred ninety-seven".