65221156 has 108 divisors (see below), whose sum is σ = 157716720. Its totient is φ = 23325120.

The previous prime is 65221133. The next prime is 65221157. The reversal of 65221156 is 65112256.

65221156 is nontrivially palindromic in base 9.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (65221157) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 364275 + ... + 364453.

It is an arithmetic number, because the mean of its divisors is an integer number (1460340).

Almost surely, 2^65221156 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 65221156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78858360).

65221156 is an abundant number, since it is smaller than the sum of its proper divisors (92495564).

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

65221156 is a wasteful number, since it uses less digits than its factorization.

65221156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234 (or 212 counting only the distinct ones).

The product of its digits is 3600, while the sum is 28.

The square root of 65221156 is about 8075.9616145695. The cubic root of 65221156 is about 402.5280635757.

Subtracting from 65221156 its reverse (65112256), we obtain a square (108900 = 330²).

The spelling of 65221156 in words is "sixty-five million, two hundred twenty-one thousand, one hundred fifty-six".