66637153741 has 4 divisors (see below), whose sum is σ = 70556986332. Its totient is φ = 62717321152.

The previous prime is 66637153733. The next prime is 66637153747. The reversal of 66637153741 is 14735173666.

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

It can be written as a sum of positive squares in 2 ways, for example, as 55403273641 + 11233880100 = 235379^2 + 105990^2 .

It is a cyclic number.

It is not a de Polignac number, because 66637153741 - 2³ = 66637153733 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 (66637153747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1959916270 + ... + 1959916303.

It is an arithmetic number, because the mean of its divisors is an integer number (17639246583).

Almost surely, 2^66637153741 is an apocalyptic number.

It is an amenable number.

66637153741 is a deficient number, since it is larger than the sum of its proper divisors (3919832591).

66637153741 is a wasteful number, since it uses less digits than its factorization.

66637153741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3919832590.

The product of its digits is 1905120, while the sum is 49.

The spelling of 66637153741 in words is "sixty-six billion, six hundred thirty-seven million, one hundred fifty-three thousand, seven hundred forty-one".