51549666694511 has 2 divisors, whose sum is σ = 51549666694512. Its totient is φ = 51549666694510.

The previous prime is 51549666694501. The next prime is 51549666694553. The reversal of 51549666694511 is 11549666694515.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51549666694511 - 2²² = 51549662500207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51549666694501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25774833347255 + 25774833347256.

It is an arithmetic number, because the mean of its divisors is an integer number (25774833347256).

Almost surely, 2^{51549666694511} is an apocalyptic number.

51549666694511 is a deficient number, since it is larger than the sum of its proper divisors (1).

51549666694511 is an equidigital number, since it uses as much as digits as its factorization.

51549666694511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952000, while the sum is 68.

The spelling of 51549666694511 in words is "fifty-one trillion, five hundred forty-nine billion, six hundred sixty-six million, six hundred ninety-four thousand, five hundred eleven".