63666345783551 has 16 divisors (see below), whose sum is σ = 73597026547200. Its totient is φ = 53948008709280.

The previous prime is 63666345783487. The next prime is 63666345783587. The reversal of 63666345783551 is 15538754366636.

It is a happy number.

It is not a de Polignac number, because 63666345783551 - 2⁶ = 63666345783487 is a prime.

It is a super-2 number, since 2×63666345783551² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63666345783451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144428171 + ... + 144868316.

It is an arithmetic number, because the mean of its divisors is an integer number (4599814159200).

Almost surely, 2^{63666345783551} is an apocalyptic number.

63666345783551 is a deficient number, since it is larger than the sum of its proper divisors (9930680763649).

63666345783551 is a wasteful number, since it uses less digits than its factorization.

63666345783551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289296854.

The product of its digits is 979776000, while the sum is 68.

The spelling of 63666345783551 in words is "sixty-three trillion, six hundred sixty-six billion, three hundred forty-five million, seven hundred eighty-three thousand, five hundred fifty-one".