66810045 has 8 divisors (see below), whose sum is σ = 106896096. Its totient is φ = 35632016.

The previous prime is 66810043. The next prime is 66810047. The reversal of 66810045 is 54001866.

It is an interprime number because it is at equal distance from previous prime (66810043) and next prime (66810047).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66810045 - 2¹ = 66810043 is a prime.

It is a super-2 number, since 2×66810045² = 8927164225804050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66809994 and 66810021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66810041) 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, 2226987 + ... + 2227016.

It is an arithmetic number, because the mean of its divisors is an integer number (13362012).

Almost surely, 2^66810045 is an apocalyptic number.

It is an amenable number.

66810045 is a deficient number, since it is larger than the sum of its proper divisors (40086051).

66810045 is a wasteful number, since it uses less digits than its factorization.

66810045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4454011.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 66810045 is about 8173.7411874857. The cubic root of 66810045 is about 405.7706102253.

It can be divided in two parts, 66 and 810045, that multiplied together give a triangular number (53462970 = T₁₀₃₄₀).

The spelling of 66810045 in words is "sixty-six million, eight hundred ten thousand, forty-five".