66551454624 has 24 divisors (see below), whose sum is σ = 174697568640. Its totient is φ = 22183818176.

The previous prime is 66551454623. The next prime is 66551454703. The reversal of 66551454624 is 42645415566.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×66551454624² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (66551454623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346622064 + ... + 346622255.

It is an arithmetic number, because the mean of its divisors is an integer number (7279065360).

Almost surely, 2^66551454624 is an apocalyptic number.

It is an amenable number.

66551454624 is an abundant number, since it is smaller than the sum of its proper divisors (108146114016).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66551454624 is a wasteful number, since it uses less digits than its factorization.

66551454624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693244332 (or 693244324 counting only the distinct ones).

The product of its digits is 3456000, while the sum is 48.

The spelling of 66551454624 in words is "sixty-six billion, five hundred fifty-one million, four hundred fifty-four thousand, six hundred twenty-four".