75139145666 has 8 divisors (see below), whose sum is σ = 121378619964. Its totient is φ = 34679605680.

The previous prime is 75139145647. The next prime is 75139145681. The reversal of 75139145666 is 66654193157.

It can be written as a sum of positive squares in 2 ways, for example, as 74790763441 + 348382225 = 273479^2 + 18665^2 .

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

It is a super-2 number, since 2×75139145666² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1444983545 + ... + 1444983596.

Almost surely, 2^75139145666 is an apocalyptic number.

75139145666 is a deficient number, since it is larger than the sum of its proper divisors (46239474298).

75139145666 is a wasteful number, since it uses less digits than its factorization.

75139145666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2889967156.

The product of its digits is 4082400, while the sum is 53.

The spelling of 75139145666 in words is "seventy-five billion, one hundred thirty-nine million, one hundred forty-five thousand, six hundred sixty-six".