64136004421 has 4 divisors (see below), whose sum is σ = 64184556844. Its totient is φ = 64087452000.

The previous prime is 64136004389. The next prime is 64136004463. The reversal of 64136004421 is 12440063146.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 48501252900 + 15634751521 = 220230^2 + 125039^2 .

It is a cyclic number.

It is not a de Polignac number, because 64136004421 - 2⁵ = 64136004389 is a prime.

It is a super-2 number, since 2×64136004421² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64136004521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24274230 + ... + 24276871.

It is an arithmetic number, because the mean of its divisors is an integer number (16046139211).

Almost surely, 2^64136004421 is an apocalyptic number.

It is an amenable number.

64136004421 is a deficient number, since it is larger than the sum of its proper divisors (48552423).

64136004421 is a wasteful number, since it uses less digits than its factorization.

64136004421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48552422.

The product of its (nonzero) digits is 13824, while the sum is 31.

Adding to 64136004421 its reverse (12440063146), we get a palindrome (76576067567).

The spelling of 64136004421 in words is "sixty-four billion, one hundred thirty-six million, four thousand, four hundred twenty-one".