81537082719 has 32 divisors (see below), whose sum is σ = 116093689344. Its totient is φ = 50788383360.

The previous prime is 81537082717. The next prime is 81537082723. The reversal of 81537082719 is 91728073518.

It is not a de Polignac number, because 81537082719 - 2¹ = 81537082717 is a prime.

It is a super-2 number, since 2×81537082719² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81537082717) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 781029 + ... + 879249.

It is an arithmetic number, because the mean of its divisors is an integer number (3627927792).

Almost surely, 2^81537082719 is an apocalyptic number.

81537082719 is a deficient number, since it is larger than the sum of its proper divisors (34556606625).

81537082719 is a wasteful number, since it uses less digits than its factorization.

81537082719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98527.

The product of its (nonzero) digits is 846720, while the sum is 51.

The spelling of 81537082719 in words is "eighty-one billion, five hundred thirty-seven million, eighty-two thousand, seven hundred nineteen".