66073642 has 4 divisors (see below), whose sum is σ = 99110466. Its totient is φ = 33036820.

The previous prime is 66073633. The next prime is 66073643. The reversal of 66073642 is 24637066.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 59151481 + 6922161 = 7691^2 + 2631^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66073598 and 66073607.

It is not an unprimeable number, because it can be changed into a prime (66073643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16518409 + ... + 16518412.

Almost surely, 2^66073642 is an apocalyptic number.

66073642 is a deficient number, since it is larger than the sum of its proper divisors (33036824).

66073642 is a wasteful number, since it uses less digits than its factorization.

66073642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33036823.

The product of its (nonzero) digits is 36288, while the sum is 34.

The square root of 66073642 is about 8128.5694928444. The cubic root of 66073642 is about 404.2742517482.

The spelling of 66073642 in words is "sixty-six million, seventy-three thousand, six hundred forty-two".