66717267551 has 16 divisors (see below), whose sum is σ = 75173683200. Its totient is φ = 58661647200.

The previous prime is 66717267493. The next prime is 66717267581. The reversal of 66717267551 is 15576271766.

It is a de Polignac number, because none of the positive numbers 2^k-66717267551 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66717267493 and 66717267502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66717267581) 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, 544205 + ... + 655433.

It is an arithmetic number, because the mean of its divisors is an integer number (4698355200).

Almost surely, 2^66717267551 is an apocalyptic number.

66717267551 is a deficient number, since it is larger than the sum of its proper divisors (8456415649).

66717267551 is a wasteful number, since it uses less digits than its factorization.

66717267551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113030.

The product of its digits is 3704400, while the sum is 53.

The spelling of 66717267551 in words is "sixty-six billion, seven hundred seventeen million, two hundred sixty-seven thousand, five hundred fifty-one".