66015757622225 has 6 divisors (see below), whose sum is σ = 81859539451590. Its totient is φ = 52812606097760.

The previous prime is 66015757622189. The next prime is 66015757622239. The reversal of 66015757622225 is 52222675751066.

It can be written as a sum of positive squares in 3 ways, for example, as 289195497361 + 65726562124864 = 537769^2 + 8107192^2 .

It is not a de Polignac number, because 66015757622225 - 2¹⁸ = 66015757360081 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1320315152420 + ... + 1320315152469.

It is an arithmetic number, because the mean of its divisors is an integer number (13643256575265).

Almost surely, 2^{66015757622225} is an apocalyptic number.

It is an amenable number.

66015757622225 is a deficient number, since it is larger than the sum of its proper divisors (15843781829365).

66015757622225 is a wasteful number, since it uses less digits than its factorization.

66015757622225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2640630304899 (or 2640630304894 counting only the distinct ones).

The product of its (nonzero) digits is 21168000, while the sum is 56.

The spelling of 66015757622225 in words is "sixty-six trillion, fifteen billion, seven hundred fifty-seven million, six hundred twenty-two thousand, two hundred twenty-five".