81510279154 has 16 divisors (see below), whose sum is σ = 123825461760. Its totient is φ = 40238365680.

The previous prime is 81510279139. The next prime is 81510279197. The reversal of 81510279154 is 45197201518.

It is a self number, because there is not a number n which added to its sum of digits gives 81510279154.

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, 759634 + ... + 860269.

It is an arithmetic number, because the mean of its divisors is an integer number (7739091360).

Almost surely, 2^81510279154 is an apocalyptic number.

81510279154 is a deficient number, since it is larger than the sum of its proper divisors (42315182606).

81510279154 is a wasteful number, since it uses less digits than its factorization.

81510279154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1620225.

The product of its (nonzero) digits is 100800, while the sum is 43.

The spelling of 81510279154 in words is "eighty-one billion, five hundred ten million, two hundred seventy-nine thousand, one hundred fifty-four".