66551373 has 12 divisors (see below), whose sum is σ = 109862688. Its totient is φ = 38029320.

The previous prime is 66551363. The next prime is 66551377. The reversal of 66551373 is 37315566.

It is a happy number.

It is not a de Polignac number, because 66551373 - 2⁵ = 66551341 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66551377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 528123 + ... + 528248.

It is an arithmetic number, because the mean of its divisors is an integer number (9155224).

Almost surely, 2^66551373 is an apocalyptic number.

66551373 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

It is an amenable number.

66551373 is a deficient number, since it is larger than the sum of its proper divisors (43311315).

66551373 is a wasteful number, since it uses less digits than its factorization.

66551373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056384 (or 1056381 counting only the distinct ones).

The product of its digits is 56700, while the sum is 36.

The square root of 66551373 is about 8157.9024877722. The cubic root of 66551373 is about 405.2462517047.

The spelling of 66551373 in words is "sixty-six million, five hundred fifty-one thousand, three hundred seventy-three".