66572545 has 16 divisors (see below), whose sum is σ = 89001360. Its totient is φ = 47464704.

The previous prime is 66572543. The next prime is 66572551. The reversal of 66572545 is 54527566.

It can be written as a sum of positive squares in 8 ways, for example, as 4036081 + 62536464 = 2009^2 + 7908^2 .

It is a cyclic number.

It is not a de Polignac number, because 66572545 - 2¹ = 66572543 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66572498 and 66572507.

It is not an unprimeable number, because it can be changed into a prime (66572543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15774 + ... + 19543.

It is an arithmetic number, because the mean of its divisors is an integer number (5562585).

Almost surely, 2^66572545 is an apocalyptic number.

66572545 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66572545 is a deficient number, since it is larger than the sum of its proper divisors (22428815).

66572545 is a wasteful number, since it uses less digits than its factorization.

66572545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35364.

The product of its digits is 252000, while the sum is 40.

The square root of 66572545 is about 8159.2000220610. The cubic root of 66572545 is about 405.2892208355.

The spelling of 66572545 in words is "sixty-six million, five hundred seventy-two thousand, five hundred forty-five".