81575626445 has 8 divisors (see below), whose sum is σ = 98117879040. Its totient is φ = 65109082960.

The previous prime is 81575626427. The next prime is 81575626453. The reversal of 81575626445 is 54462657518.

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

It is not a de Polignac number, because 81575626445 - 2⁶ = 81575626381 is a prime.

It is a congruent number.

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, 18924905 + ... + 18929214.

It is an arithmetic number, because the mean of its divisors is an integer number (12264734880).

Almost surely, 2^81575626445 is an apocalyptic number.

It is an amenable number.

81575626445 is a deficient number, since it is larger than the sum of its proper divisors (16542252595).

81575626445 is a wasteful number, since it uses less digits than its factorization.

81575626445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37854555.

The product of its digits is 8064000, while the sum is 53.

The spelling of 81575626445 in words is "eighty-one billion, five hundred seventy-five million, six hundred twenty-six thousand, four hundred forty-five".