81154477370566 has 8 divisors (see below), whose sum is σ = 122869395645480. Its totient is φ = 40198012155408.

The previous prime is 81154477370543. The next prime is 81154477370567. The reversal of 81154477370566 is 66507377445118.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 81154477370498 and 81154477370507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81154477370567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189613264671 + ... + 189613265098.

It is an arithmetic number, because the mean of its divisors is an integer number (15358674455685).

Almost surely, 2^{81154477370566} is an apocalyptic number.

81154477370566 is a deficient number, since it is larger than the sum of its proper divisors (41714918274914).

81154477370566 is a wasteful number, since it uses less digits than its factorization.

81154477370566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379226529878.

The product of its (nonzero) digits is 118540800, while the sum is 64.

The spelling of 81154477370566 in words is "eighty-one trillion, one hundred fifty-four billion, four hundred seventy-seven million, three hundred seventy thousand, five hundred sixty-six".