81000694655 has 8 divisors (see below), whose sum is σ = 99461318352. Its totient is φ = 63293565888.

The previous prime is 81000694573. The next prime is 81000694657. The reversal of 81000694655 is 55649600018.

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

It is a cyclic number.

It is not a de Polignac number, because 81000694655 - 2¹⁴ = 81000678271 is a prime.

It is a super-2 number, since 2×81000694655² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81000694657) 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, 188373494 + ... + 188373923.

It is an arithmetic number, because the mean of its divisors is an integer number (12432664794).

Almost surely, 2^81000694655 is an apocalyptic number.

81000694655 is a deficient number, since it is larger than the sum of its proper divisors (18460623697).

81000694655 is a wasteful number, since it uses less digits than its factorization.

81000694655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376747465.

The product of its (nonzero) digits is 259200, while the sum is 44.

The spelling of 81000694655 in words is "eighty-one billion, six hundred ninety-four thousand, six hundred fifty-five".