81895407848 has 16 divisors (see below), whose sum is σ = 153585180000. Its totient is φ = 40939359856.

The previous prime is 81895407829. The next prime is 81895407857. The reversal of 81895407848 is 84870459818.

It is a super-2 number, since 2×81895407848² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1001198 + ... + 1079901.

It is an arithmetic number, because the mean of its divisors is an integer number (9599073750).

Almost surely, 2^81895407848 is an apocalyptic number.

It is an amenable number.

81895407848 is a deficient number, since it is larger than the sum of its proper divisors (71689772152).

81895407848 is a wasteful number, since it uses less digits than its factorization.

81895407848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2086024 (or 2086020 counting only the distinct ones).

The product of its (nonzero) digits is 20643840, while the sum is 62.

The spelling of 81895407848 in words is "eighty-one billion, eight hundred ninety-five million, four hundred seven thousand, eight hundred forty-eight".