81624339206 has 16 divisors (see below), whose sum is σ = 129648230640. Its totient is φ = 38408616960.

The previous prime is 81624339197. The next prime is 81624339211. The reversal of 81624339206 is 60293342618.

It is a super-2 number, since 2×81624339206² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 420950 + ... + 583478.

It is an arithmetic number, because the mean of its divisors is an integer number (8103014415).

Almost surely, 2^81624339206 is an apocalyptic number.

81624339206 is a deficient number, since it is larger than the sum of its proper divisors (48023891434).

81624339206 is a wasteful number, since it uses less digits than its factorization.

81624339206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177319.

The product of its (nonzero) digits is 373248, while the sum is 44.

The spelling of 81624339206 in words is "eighty-one billion, six hundred twenty-four million, three hundred thirty-nine thousand, two hundred six".