66156552 has 96 divisors (see below), whose sum is σ = 223404480. Its totient is φ = 17182080.

The previous prime is 66156551. The next prime is 66156557. The reversal of 66156552 is 25565166.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (66156551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 423 + ... + 11510.

It is an arithmetic number, because the mean of its divisors is an integer number (2327130).

Almost surely, 2^66156552 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 66156552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111702240).

66156552 is an abundant number, since it is smaller than the sum of its proper divisors (157247928).

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

66156552 is a wasteful number, since it uses less digits than its factorization.

66156552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11963 (or 11956 counting only the distinct ones).

The product of its digits is 54000, while the sum is 36.

The square root of 66156552 is about 8133.6678073302. The cubic root of 66156552 is about 404.4432771326.

The spelling of 66156552 in words is "sixty-six million, one hundred fifty-six thousand, five hundred fifty-two".