66560700557951 has 2 divisors, whose sum is σ = 66560700557952. Its totient is φ = 66560700557950.

The previous prime is 66560700557941. The next prime is 66560700557969. The reversal of 66560700557951 is 15975500706566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66560700557951 - 2²⁶ = 66560633449087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66560700557921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33280350278975 + 33280350278976.

It is an arithmetic number, because the mean of its divisors is an integer number (33280350278976).

Almost surely, 2^{66560700557951} is an apocalyptic number.

66560700557951 is a deficient number, since it is larger than the sum of its proper divisors (1).

66560700557951 is an equidigital number, since it uses as much as digits as its factorization.

66560700557951 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 59535000, while the sum is 62.

The spelling of 66560700557951 in words is "sixty-six trillion, five hundred sixty billion, seven hundred million, five hundred fifty-seven thousand, nine hundred fifty-one".