8021156544 has 140 divisors (see below), whose sum is σ = 23904659328. Its totient is φ = 2659392000.

The previous prime is 8021156537. The next prime is 8021156569. The reversal of 8021156544 is 4456511208.

It is a happy number.

8021156544 is a `hidden beast` number, since 80 + 2 + 11 + 565 + 4 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 8021156499 and 8021156508.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 986094 + ... + 994194.

Almost surely, 2^8021156544 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8021156544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11952329664).

8021156544 is an abundant number, since it is smaller than the sum of its proper divisors (15883502784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8021156544 is a wasteful number, since it uses less digits than its factorization.

8021156544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8316 (or 8297 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The square root of 8021156544 is about 89560.9096872067. The cubic root of 8021156544 is about 2001.7614934483.

The spelling of 8021156544 in words is "eight billion, twenty-one million, one hundred fifty-six thousand, five hundred forty-four".