66212045 has 16 divisors (see below), whose sum is σ = 81725952. Its totient is φ = 51468480.

The previous prime is 66212021. The next prime is 66212053. The reversal of 66212045 is 54021266.

It is not a de Polignac number, because 66212045 - 2¹⁰ = 66211021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47255 + ... + 48635.

It is an arithmetic number, because the mean of its divisors is an integer number (5107872).

Almost surely, 2^66212045 is an apocalyptic number.

It is an amenable number.

66212045 is a deficient number, since it is larger than the sum of its proper divisors (15513907).

66212045 is a wasteful number, since it uses less digits than its factorization.

66212045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1652.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 66212045 is about 8137.0784068977. The cubic root of 66212045 is about 404.5563296706.

The spelling of 66212045 in words is "sixty-six million, two hundred twelve thousand, forty-five".