81769456898 has 8 divisors (see below), whose sum is σ = 122656485900. Its totient is φ = 40883961600.

The previous prime is 81769456843. The next prime is 81769456933. The reversal of 81769456898 is 89865496718.

It can be written as a sum of positive squares in 2 ways, for example, as 66784514329 + 14984942569 = 258427^2 + 122413^2 .

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

It is a super-3 number, since 3×81769456898³ (a number of 34 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239303 + ... + 469898.

Almost surely, 2^81769456898 is an apocalyptic number.

81769456898 is a deficient number, since it is larger than the sum of its proper divisors (40887029002).

81769456898 is a wasteful number, since it uses less digits than its factorization.

81769456898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766852.

The product of its digits is 209018880, while the sum is 71.

The spelling of 81769456898 in words is "eighty-one billion, seven hundred sixty-nine million, four hundred fifty-six thousand, eight hundred ninety-eight".