66106107152021 has 32 divisors (see below), whose sum is σ = 69225724459008. Its totient is φ = 63007490589120.

The previous prime is 66106107151963. The next prime is 66106107152047. The reversal of 66106107152021 is 12025170160166.

It is a cyclic number.

It is not a de Polignac number, because 66106107152021 - 2¹⁴ = 66106107135637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66106107152621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21553994930 + ... + 21553997996.

It is an arithmetic number, because the mean of its divisors is an integer number (2163303889344).

Almost surely, 2^{66106107152021} is an apocalyptic number.

It is an amenable number.

66106107152021 is a deficient number, since it is larger than the sum of its proper divisors (3119617306987).

66106107152021 is a wasteful number, since it uses less digits than its factorization.

66106107152021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6161.

The product of its (nonzero) digits is 30240, while the sum is 38.

The spelling of 66106107152021 in words is "sixty-six trillion, one hundred six billion, one hundred seven million, one hundred fifty-two thousand, twenty-one".