64618949 has 2 divisors, whose sum is σ = 64618950. Its totient is φ = 64618948.

The previous prime is 64618913. The next prime is 64618951. The reversal of 64618949 is 94981646.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64288324 + 330625 = 8018^2 + 575^2 .

It is a cyclic number.

It is not a de Polignac number, because 64618949 - 2⁸ = 64618693 is a prime.

Together with 64618951, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64618979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32309474 + 32309475.

It is an arithmetic number, because the mean of its divisors is an integer number (32309475).

Almost surely, 2^64618949 is an apocalyptic number.

It is an amenable number.

64618949 is a deficient number, since it is larger than the sum of its proper divisors (1).

64618949 is an equidigital number, since it uses as much as digits as its factorization.

64618949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 47.

The square root of 64618949 is about 8038.5912322994. The cubic root of 64618949 is about 401.2853423966.

The spelling of 64618949 in words is "sixty-four million, six hundred eighteen thousand, nine hundred forty-nine".