66654451 has 6 divisors (see below), whose sum is σ = 70200060. Its totient is φ = 63112608.

The previous prime is 66654421. The next prime is 66654487. The reversal of 66654451 is 15445666.

It is not a de Polignac number, because 66654451 - 2⁷ = 66654323 is a prime.

It is a super-2 number, since 2×66654451² = 8885631676222802, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66654451.

It is not an unprimeable number, because it can be changed into a prime (66654421) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34651 + ... + 36523.

It is an arithmetic number, because the mean of its divisors is an integer number (11700010).

Almost surely, 2^66654451 is an apocalyptic number.

66654451 is a deficient number, since it is larger than the sum of its proper divisors (3545609).

66654451 is an frugal number, since it uses more digits than its factorization.

66654451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3765 (or 1892 counting only the distinct ones).

The product of its digits is 86400, while the sum is 37.

The square root of 66654451 is about 8164.2177212517. The cubic root of 66654451 is about 405.4553654747.

The spelling of 66654451 in words is "sixty-six million, six hundred fifty-four thousand, four hundred fifty-one".