66252736745 has 16 divisors (see below), whose sum is σ = 85624901712. Its totient is φ = 48921680640.

The previous prime is 66252736703. The next prime is 66252736747. The reversal of 66252736745 is 54763725266.

It can be written as a sum of positive squares in 8 ways, for example, as 5113251049 + 61139485696 = 71507^2 + 247264^2 .

It is not a de Polignac number, because 66252736745 - 2⁶ = 66252736681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66252736747) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1264775 + ... + 1316115.

It is an arithmetic number, because the mean of its divisors is an integer number (5351556357).

Almost surely, 2^66252736745 is an apocalyptic number.

66252736745 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66252736745 is a deficient number, since it is larger than the sum of its proper divisors (19372164967).

66252736745 is a wasteful number, since it uses less digits than its factorization.

66252736745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71212.

The product of its digits is 12700800, while the sum is 53.

The spelling of 66252736745 in words is "sixty-six billion, two hundred fifty-two million, seven hundred thirty-six thousand, seven hundred forty-five".