64425553 has 4 divisors (see below), whose sum is σ = 67226688. Its totient is φ = 61624420.

The previous prime is 64425541. The next prime is 64425589. The reversal of 64425553 is 35552446.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 35552446 = 2 ⋅17776223.

It is a cyclic number.

It is not a de Polignac number, because 64425553 - 2⁹ = 64425041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64425593) 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, 1400533 + ... + 1400578.

It is an arithmetic number, because the mean of its divisors is an integer number (16806672).

Almost surely, 2^64425553 is an apocalyptic number.

It is an amenable number.

64425553 is a deficient number, since it is larger than the sum of its proper divisors (2801135).

64425553 is a wasteful number, since it uses less digits than its factorization.

64425553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2801134.

The product of its digits is 72000, while the sum is 34.

The square root of 64425553 is about 8026.5529961497. The cubic root of 64425553 is about 400.8846109664.

Adding to 64425553 its reverse (35552446), we get a palindrome (99977999).

The spelling of 64425553 in words is "sixty-four million, four hundred twenty-five thousand, five hundred fifty-three".