266161572 has 96 divisors (see below), whose sum is σ = 725648000. Its totient is φ = 84260736.

The previous prime is 266161561. The next prime is 266161573. The reversal of 266161572 is 275161662.

It is a happy number.

266161572 is a `hidden beast` number, since 26 + 6 + 1 + 61 + 572 = 666.

It is a super-2 number, since 2×266161572² = 141683964819022368, which contains 22 as substring.

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 (266161573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 171054 + ... + 172602.

Almost surely, 2^266161572 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 266161572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (362824000).

266161572 is an abundant number, since it is smaller than the sum of its proper divisors (459486428).

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

266161572 is a wasteful number, since it uses less digits than its factorization.

266161572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1642 (or 1634 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 266161572 is about 16314.4589858199. The cubic root of 266161572 is about 643.2529466049.

The spelling of 266161572 in words is "two hundred sixty-six million, one hundred sixty-one thousand, five hundred seventy-two".