66156496 has 40 divisors (see below), whose sum is σ = 148363520. Its totient is φ = 27990144.

The previous prime is 66156491. The next prime is 66156509. The reversal of 66156496 is 69465166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66156491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5110 + ... + 12586.

It is an arithmetic number, because the mean of its divisors is an integer number (3709088).

Almost surely, 2^66156496 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 66156496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74181760).

66156496 is an abundant number, since it is smaller than the sum of its proper divisors (82207024).

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

66156496 is a wasteful number, since it uses less digits than its factorization.

66156496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7571 (or 7565 counting only the distinct ones).

The product of its digits is 233280, while the sum is 43.

The square root of 66156496 is about 8133.6643648481. The cubic root of 66156496 is about 404.4431630153.

The spelling of 66156496 in words is "sixty-six million, one hundred fifty-six thousand, four hundred ninety-six".