66797445 has 96 divisors (see below), whose sum is σ = 134064000. Its totient is φ = 28131840.

The previous prime is 66797443. The next prime is 66797453. The reversal of 66797445 is 54479766.

66797445 = 1866² + 1867² + ... + 1884².

It is not a de Polignac number, because 66797445 - 2¹ = 66797443 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66797394 and 66797403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66797441) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 448231 + ... + 448379.

It is an arithmetic number, because the mean of its divisors is an integer number (1396500).

Almost surely, 2^66797445 is an apocalyptic number.

66797445 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

66797445 is the 4719-th octagonal number.

It is an amenable number.

66797445 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

66797445 is a wasteful number, since it uses less digits than its factorization.

66797445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211 (or 200 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 48.

The square root of 66797445 is about 8172.9703902559. The cubic root of 66797445 is about 405.7450999340.

The spelling of 66797445 in words is "sixty-six million, seven hundred ninety-seven thousand, four hundred forty-five".