81972714153 has 8 divisors (see below), whose sum is σ = 119233038816. Its totient is φ = 49680432800.

The previous prime is 81972714143. The next prime is 81972714191. The reversal of 81972714153 is 35141727918.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81972714153 - 2⁵ = 81972714121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81972714143) 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 7 ways as a sum of consecutive naturals, for example, 1242010788 + ... + 1242010853.

It is an arithmetic number, because the mean of its divisors is an integer number (14904129852).

Almost surely, 2^81972714153 is an apocalyptic number.

It is an amenable number.

81972714153 is a deficient number, since it is larger than the sum of its proper divisors (37260324663).

81972714153 is a wasteful number, since it uses less digits than its factorization.

81972714153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2484021655.

The product of its digits is 423360, while the sum is 48.

The spelling of 81972714153 in words is "eighty-one billion, nine hundred seventy-two million, seven hundred fourteen thousand, one hundred fifty-three".