81869061379 has 12 divisors (see below), whose sum is σ = 95243998608. Its totient is φ = 70167174000.

The previous prime is 81869061347. The next prime is 81869061389. The reversal of 81869061379 is 97316096818.

It is not a de Polignac number, because 81869061379 - 2⁵ = 81869061347 is a prime.

It is a super-2 number, since 2×81869061379² (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 (81869061389) 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 11 ways as a sum of consecutive naturals, for example, 523914 + ... + 661984.

It is an arithmetic number, because the mean of its divisors is an integer number (7936999884).

Almost surely, 2^81869061379 is an apocalyptic number.

81869061379 is a deficient number, since it is larger than the sum of its proper divisors (13374937229).

81869061379 is a wasteful number, since it uses less digits than its factorization.

81869061379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150186 (or 150179 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 58.

The spelling of 81869061379 in words is "eighty-one billion, eight hundred sixty-nine million, sixty-one thousand, three hundred seventy-nine".