81546629343 has 8 divisors (see below), whose sum is σ = 109275216000. Its totient is φ = 54091231128.

The previous prime is 81546629239. The next prime is 81546629393. The reversal of 81546629343 is 34392664518.

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

It is not a de Polignac number, because 81546629343 - 2²¹ = 81544532191 is a prime.

It is a super-2 number, since 2×81546629343² (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 (81546629393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68296413 + ... + 68297606.

It is an arithmetic number, because the mean of its divisors is an integer number (13659402000).

Almost surely, 2^81546629343 is an apocalyptic number.

81546629343 is a deficient number, since it is larger than the sum of its proper divisors (27728586657).

81546629343 is a wasteful number, since it uses less digits than its factorization.

81546629343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136594221.

The product of its digits is 3732480, while the sum is 51.

The spelling of 81546629343 in words is "eighty-one billion, five hundred forty-six million, six hundred twenty-nine thousand, three hundred forty-three".