81148010477 has 8 divisors (see below), whose sum is σ = 85924505016. Its totient is φ = 76371858432.

The previous prime is 81148010473. The next prime is 81148010491. The reversal of 81148010477 is 77401084118.

It can be written as a sum of positive squares in 4 ways, for example, as 36800283556 + 44347726921 = 191834^2 + 210589^2 .

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 81148010477 - 2² = 81148010473 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81148010473) 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, 527813 + ... + 663989.

It is an arithmetic number, because the mean of its divisors is an integer number (10740563127).

Almost surely, 2^81148010477 is an apocalyptic number.

It is an amenable number.

81148010477 is a deficient number, since it is larger than the sum of its proper divisors (4776494539).

81148010477 is a wasteful number, since it uses less digits than its factorization.

81148010477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171247.

The product of its (nonzero) digits is 50176, while the sum is 41.

The spelling of 81148010477 in words is "eighty-one billion, one hundred forty-eight million, ten thousand, four hundred seventy-seven".