646743513 has 16 divisors (see below), whose sum is σ = 929388096. Its totient is φ = 397682880.

The previous prime is 646743511. The next prime is 646743541. The reversal of 646743513 is 315347646.

It is not a de Polignac number, because 646743513 - 2¹ = 646743511 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (646743511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49843 + ... + 61463.

It is an arithmetic number, because the mean of its divisors is an integer number (58086756).

Almost surely, 2^646743513 is an apocalyptic number.

It is an amenable number.

646743513 is a deficient number, since it is larger than the sum of its proper divisors (282644583).

646743513 is a wasteful number, since it uses less digits than its factorization.

646743513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13064.

The product of its digits is 181440, while the sum is 39.

The square root of 646743513 is about 25431.1524119533. The cubic root of 646743513 is about 864.7900692284.

The spelling of 646743513 in words is "six hundred forty-six million, seven hundred forty-three thousand, five hundred thirteen".