66551454551 has 2 divisors, whose sum is σ = 66551454552. Its totient is φ = 66551454550.

The previous prime is 66551454539. The next prime is 66551454589. The reversal of 66551454551 is 15545415566.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66551454551 is a prime.

It is a super-2 number, since 2×66551454551² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66551454496 and 66551454505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66551457551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33275727275 + 33275727276.

It is an arithmetic number, because the mean of its divisors is an integer number (33275727276).

Almost surely, 2^66551454551 is an apocalyptic number.

66551454551 is a deficient number, since it is larger than the sum of its proper divisors (1).

66551454551 is an equidigital number, since it uses as much as digits as its factorization.

66551454551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1800000, while the sum is 47.

The spelling of 66551454551 in words is "sixty-six billion, five hundred fifty-one million, four hundred fifty-four thousand, five hundred fifty-one".