6651959 has 2 divisors, whose sum is σ = 6651960. Its totient is φ = 6651958.

The previous prime is 6651941. The next prime is 6652001. The reversal of 6651959 is 9591566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6651959 - 2¹⁶ = 6586423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6681959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3325979 + 3325980.

It is an arithmetic number, because the mean of its divisors is an integer number (3325980).

Almost surely, 2^6651959 is an apocalyptic number.

6651959 is a deficient number, since it is larger than the sum of its proper divisors (1).

6651959 is an equidigital number, since it uses as much as digits as its factorization.

6651959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72900, while the sum is 41.

The square root of 6651959 is about 2579.1391974843. The cubic root of 6651959 is about 188.0686994286.

It can be divided in two parts, 66 and 51959, that added together give a palindrome (52025).

The spelling of 6651959 in words is "six million, six hundred fifty-one thousand, nine hundred fifty-nine".