26664947 has 2 divisors, whose sum is σ = 26664948. Its totient is φ = 26664946.

The previous prime is 26664943. The next prime is 26664971. The reversal of 26664947 is 74946662.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26664947 - 2² = 26664943 is a prime.

It is a super-2 number, since 2×26664947² = 1422038797025618, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 26664898 and 26664907.

It is not a weakly prime, because it can be changed into another prime (26664941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13332473 + 13332474.

It is an arithmetic number, because the mean of its divisors is an integer number (13332474).

Almost surely, 2^26664947 is an apocalyptic number.

26664947 is a deficient number, since it is larger than the sum of its proper divisors (1).

26664947 is an equidigital number, since it uses as much as digits as its factorization.

26664947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 44.

The square root of 26664947 is about 5163.8112862497. The cubic root of 26664947 is about 298.7538941971.

The spelling of 26664947 in words is "twenty-six million, six hundred sixty-four thousand, nine hundred forty-seven".