81501732419 has 4 divisors (see below), whose sum is σ = 81851525496. Its totient is φ = 81151939344.

The previous prime is 81501732407. The next prime is 81501732427. The reversal of 81501732419 is 91423710518.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81501732419 - 2¹² = 81501728323 is a prime.

It is a super-2 number, since 2×81501732419² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81501732919) 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, 174896189 + ... + 174896654.

It is an arithmetic number, because the mean of its divisors is an integer number (20462881374).

Almost surely, 2^81501732419 is an apocalyptic number.

81501732419 is a deficient number, since it is larger than the sum of its proper divisors (349793077).

81501732419 is a wasteful number, since it uses less digits than its factorization.

81501732419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349793076.

The product of its (nonzero) digits is 60480, while the sum is 41.

The spelling of 81501732419 in words is "eighty-one billion, five hundred one million, seven hundred thirty-two thousand, four hundred nineteen".