81510712054 has 8 divisors (see below), whose sum is σ = 122281780680. Its totient is φ = 40750118496.

The previous prime is 81510712051. The next prime is 81510712057. The reversal of 81510712054 is 45021701518.

It is an interprime number because it is at equal distance from previous prime (81510712051) and next prime (81510712057).

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

It is a super-5 number, since 5×81510712054⁵ (a number of 56 digits) contains 55555 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81510712051) 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, 2599284 + ... + 2630455.

It is an arithmetic number, because the mean of its divisors is an integer number (15285222585).

Almost surely, 2^81510712054 is an apocalyptic number.

81510712054 is a deficient number, since it is larger than the sum of its proper divisors (40771068626).

81510712054 is a wasteful number, since it uses less digits than its factorization.

81510712054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5237534.

The product of its (nonzero) digits is 11200, while the sum is 34.

The spelling of 81510712054 in words is "eighty-one billion, five hundred ten million, seven hundred twelve thousand, fifty-four".