81630029371 has 32 divisors (see below), whose sum is σ = 93637739520. Its totient is φ = 70480368000.

The previous prime is 81630029363. The next prime is 81630029387. The reversal of 81630029371 is 17392003618.

It is a cyclic number.

It is not a de Polignac number, because 81630029371 - 2³ = 81630029363 is a prime.

It is a super-2 number, since 2×81630029371² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81630029311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4953181 + ... + 4969633.

It is an arithmetic number, because the mean of its divisors is an integer number (2926179360).

Almost surely, 2^81630029371 is an apocalyptic number.

81630029371 is a deficient number, since it is larger than the sum of its proper divisors (12007710149).

81630029371 is a wasteful number, since it uses less digits than its factorization.

81630029371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16747.

The product of its (nonzero) digits is 54432, while the sum is 40.

The spelling of 81630029371 in words is "eighty-one billion, six hundred thirty million, twenty-nine thousand, three hundred seventy-one".