66800722 has 16 divisors (see below), whose sum is σ = 103993344. Its totient is φ = 32148000.

The previous prime is 66800711. The next prime is 66800729. The reversal of 66800722 is 22700866.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (66800729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9022 + ... + 14662.

It is an arithmetic number, because the mean of its divisors is an integer number (6499584).

Almost surely, 2^66800722 is an apocalyptic number.

66800722 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

66800722 is a deficient number, since it is larger than the sum of its proper divisors (37192622).

66800722 is a wasteful number, since it uses less digits than its factorization.

66800722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5865.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 66800722 is about 8173.1708657044. The cubic root of 66800722 is about 405.7517349430.

The spelling of 66800722 in words is "sixty-six million, eight hundred thousand, seven hundred twenty-two".