8156821495444 has 48 divisors (see below), whose sum is σ = 14836112121600. Its totient is φ = 3920713804800.

The previous prime is 8156821495429. The next prime is 8156821495447. The reversal of 8156821495444 is 4445941286518.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8156821495447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8124969 + ... + 9073519.

It is an arithmetic number, because the mean of its divisors is an integer number (309085669200).

Almost surely, 2^{8156821495444} is an apocalyptic number.

It is an amenable number.

8156821495444 is a deficient number, since it is larger than the sum of its proper divisors (6679290626156).

8156821495444 is a wasteful number, since it uses less digits than its factorization.

8156821495444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 949288 (or 949286 counting only the distinct ones).

The product of its digits is 44236800, while the sum is 61.

The spelling of 8156821495444 in words is "eight trillion, one hundred fifty-six billion, eight hundred twenty-one million, four hundred ninety-five thousand, four hundred forty-four".