66888937 has 2 divisors, whose sum is σ = 66888938. Its totient is φ = 66888936.

The previous prime is 66888919. The next prime is 66888961. The reversal of 66888937 is 73988866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48664576 + 18224361 = 6976^2 + 4269^2 .

It is a cyclic number.

It is not a de Polignac number, because 66888937 - 2¹⁵ = 66856169 is a prime.

It is not a weakly prime, because it can be changed into another prime (66888907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33444468 + 33444469.

It is an arithmetic number, because the mean of its divisors is an integer number (33444469).

Almost surely, 2^66888937 is an apocalyptic number.

It is an amenable number.

66888937 is a deficient number, since it is larger than the sum of its proper divisors (1).

66888937 is an equidigital number, since it uses as much as digits as its factorization.

66888937 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3483648, while the sum is 55.

The square root of 66888937 is about 8178.5657055501. The cubic root of 66888937 is about 405.9302641759.

It can be divided in two parts, 6688 and 8937, that added together give a 6-th power (15625 = 5⁶).

The spelling of 66888937 in words is "sixty-six million, eight hundred eighty-eight thousand, nine hundred thirty-seven".