64419661 has 2 divisors, whose sum is σ = 64419662. Its totient is φ = 64419660.

The previous prime is 64419659. The next prime is 64419697. The reversal of 64419661 is 16691446.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37576900 + 26842761 = 6130^2 + 5181^2 .

It is a cyclic number.

It is not a de Polignac number, because 64419661 - 2¹ = 64419659 is a prime.

Together with 64419659, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 64419661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64419961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32209830 + 32209831.

It is an arithmetic number, because the mean of its divisors is an integer number (32209831).

Almost surely, 2^64419661 is an apocalyptic number.

It is an amenable number.

64419661 is a deficient number, since it is larger than the sum of its proper divisors (1).

64419661 is an equidigital number, since it uses as much as digits as its factorization.

64419661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 37.

The square root of 64419661 is about 8026.1859559818. The cubic root of 64419661 is about 400.8723897073.

The spelling of 64419661 in words is "sixty-four million, four hundred nineteen thousand, six hundred sixty-one".