66156545 has 16 divisors (see below), whose sum is σ = 97708800. Its totient is φ = 41874624.

The previous prime is 66156539. The next prime is 66156547. The reversal of 66156545 is 54565166.

It is a cyclic number.

It is not a de Polignac number, because 66156545 - 2⁴ = 66156529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66156499 and 66156508.

It is not an unprimeable number, because it can be changed into a prime (66156547) 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, 72245 + ... + 73154.

It is an arithmetic number, because the mean of its divisors is an integer number (6106800).

Almost surely, 2^66156545 is an apocalyptic number.

66156545 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66156545 is a deficient number, since it is larger than the sum of its proper divisors (31552255).

66156545 is a wasteful number, since it uses less digits than its factorization.

66156545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145424.

The product of its digits is 108000, while the sum is 38.

The square root of 66156545 is about 8133.6673770200. The cubic root of 66156545 is about 404.4432628679.

The spelling of 66156545 in words is "sixty-six million, one hundred fifty-six thousand, five hundred forty-five".