64553819 has 4 divisors (see below), whose sum is σ = 70422360. Its totient is φ = 58685280.

The previous prime is 64553807. The next prime is 64553821. The reversal of 64553819 is 91835546.

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

It is a cyclic number.

It is not a de Polignac number, because 64553819 - 2²⁰ = 63505243 is a prime.

It is a super-2 number, since 2×64553819² = 8334391094969522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64553899) 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, 2934254 + ... + 2934275.

It is an arithmetic number, because the mean of its divisors is an integer number (17605590).

Almost surely, 2^64553819 is an apocalyptic number.

64553819 is a deficient number, since it is larger than the sum of its proper divisors (5868541).

64553819 is a wasteful number, since it uses less digits than its factorization.

64553819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5868540.

The product of its digits is 129600, while the sum is 41.

The square root of 64553819 is about 8034.5391280396. The cubic root of 64553819 is about 401.1504774152.

The spelling of 64553819 in words is "sixty-four million, five hundred fifty-three thousand, eight hundred nineteen".