646553135 has 4 divisors (see below), whose sum is σ = 775863768. Its totient is φ = 517242504.

The previous prime is 646553123. The next prime is 646553137. The reversal of 646553135 is 531355646.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 531355646 = 2 ⋅265677823.

It is a cyclic number.

It is not a de Polignac number, because 646553135 - 2¹⁰ = 646552111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646553137) 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, 64655309 + ... + 64655318.

It is an arithmetic number, because the mean of its divisors is an integer number (193965942).

Almost surely, 2^646553135 is an apocalyptic number.

646553135 is a deficient number, since it is larger than the sum of its proper divisors (129310633).

646553135 is a wasteful number, since it uses less digits than its factorization.

646553135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129310632.

The product of its digits is 162000, while the sum is 38.

The square root of 646553135 is about 25427.4091287335. The cubic root of 646553135 is about 864.7052065497.

The spelling of 646553135 in words is "six hundred forty-six million, five hundred fifty-three thousand, one hundred thirty-five".