81526147858461 has 8 divisors (see below), whose sum is σ = 108880610431744. Its totient is φ = 54261225262080.

The previous prime is 81526147858429. The next prime is 81526147858471. The reversal of 81526147858461 is 16485874162518.

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

It is not a de Polignac number, because 81526147858461 - 2⁵ = 81526147858429 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81526147858392 and 81526147858401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81526147858471) 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, 22384992100 + ... + 22384995741.

It is an arithmetic number, because the mean of its divisors is an integer number (13610076303968).

Almost surely, 2^{81526147858461} is an apocalyptic number.

It is an amenable number.

81526147858461 is a deficient number, since it is larger than the sum of its proper divisors (27354462573283).

81526147858461 is a wasteful number, since it uses less digits than its factorization.

81526147858461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44769988451.

The product of its digits is 103219200, while the sum is 66.

The spelling of 81526147858461 in words is "eighty-one trillion, five hundred twenty-six billion, one hundred forty-seven million, eight hundred fifty-eight thousand, four hundred sixty-one".