42664361 has 2 divisors, whose sum is σ = 42664362. Its totient is φ = 42664360.

The previous prime is 42664357. The next prime is 42664381. The reversal of 42664361 is 16346624.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40246336 + 2418025 = 6344^2 + 1555^2 .

It is a cyclic number.

It is not a de Polignac number, because 42664361 - 2² = 42664357 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42664301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21332180 + 21332181.

It is an arithmetic number, because the mean of its divisors is an integer number (21332181).

Almost surely, 2^42664361 is an apocalyptic number.

It is an amenable number.

42664361 is a deficient number, since it is larger than the sum of its proper divisors (1).

42664361 is an equidigital number, since it uses as much as digits as its factorization.

42664361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 32.

The square root of 42664361 is about 6531.7961541983. The cubic root of 42664361 is about 349.4258914519.

The spelling of 42664361 in words is "forty-two million, six hundred sixty-four thousand, three hundred sixty-one".