81511526854 has 8 divisors (see below), whose sum is σ = 123989365008. Its totient is φ = 40181738520.

The previous prime is 81511526819. The next prime is 81511526881. The reversal of 81511526854 is 45862511518.

It is a happy number.

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

It is a congruent number.

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, 287012277 + ... + 287012560.

It is an arithmetic number, because the mean of its divisors is an integer number (15498670626).

Almost surely, 2^81511526854 is an apocalyptic number.

81511526854 is a deficient number, since it is larger than the sum of its proper divisors (42477838154).

81511526854 is a wasteful number, since it uses less digits than its factorization.

81511526854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574024910.

The product of its digits is 384000, while the sum is 46.

The spelling of 81511526854 in words is "eighty-one billion, five hundred eleven million, five hundred twenty-six thousand, eight hundred fifty-four".