64642658419 has 2 divisors, whose sum is σ = 64642658420. Its totient is φ = 64642658418.

The previous prime is 64642658413. The next prime is 64642658467. The reversal of 64642658419 is 91485624646.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64642658419 - 2¹³ = 64642650227 is a prime.

It is a super-2 number, since 2×64642658419² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64642658419.

It is not a weakly prime, because it can be changed into another prime (64642658413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32321329209 + 32321329210.

It is an arithmetic number, because the mean of its divisors is an integer number (32321329210).

Almost surely, 2^64642658419 is an apocalyptic number.

64642658419 is a deficient number, since it is larger than the sum of its proper divisors (1).

64642658419 is an equidigital number, since it uses as much as digits as its factorization.

64642658419 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9953280, while the sum is 55.

The spelling of 64642658419 in words is "sixty-four billion, six hundred forty-two million, six hundred fifty-eight thousand, four hundred nineteen".