81651519429 has 16 divisors (see below), whose sum is σ = 114604689600. Its totient is φ = 51566651136.

The previous prime is 81651519409. The next prime is 81651519479. The reversal of 81651519429 is 92491515618.

It is not a de Polignac number, because 81651519429 - 2²¹ = 81649422277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81651519409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2016507 + ... + 2056599.

It is an arithmetic number, because the mean of its divisors is an integer number (7162793100).

Almost surely, 2^81651519429 is an apocalyptic number.

It is an amenable number.

81651519429 is a deficient number, since it is larger than the sum of its proper divisors (32953170171).

81651519429 is a wasteful number, since it uses less digits than its factorization.

81651519429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75844.

The product of its digits is 777600, while the sum is 51.

The spelling of 81651519429 in words is "eighty-one billion, six hundred fifty-one million, five hundred nineteen thousand, four hundred twenty-nine".