646612145 has 8 divisors (see below), whose sum is σ = 784653480. Its totient is φ = 511477120.

The previous prime is 646612121. The next prime is 646612147. The reversal of 646612145 is 541216646.

It can be written as a sum of positive squares in 4 ways, for example, as 26801329 + 619810816 = 5177^2 + 24896^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 646612145 - 2²⁴ = 629834929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (646612147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 726086 + ... + 726975.

It is an arithmetic number, because the mean of its divisors is an integer number (98081685).

Almost surely, 2^646612145 is an apocalyptic number.

It is an amenable number.

646612145 is a deficient number, since it is larger than the sum of its proper divisors (138041335).

646612145 is a wasteful number, since it uses less digits than its factorization.

646612145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1453155.

The product of its digits is 34560, while the sum is 35.

The square root of 646612145 is about 25428.5694642856. The cubic root of 646612145 is about 864.7315125608.

The spelling of 646612145 in words is "six hundred forty-six million, six hundred twelve thousand, one hundred forty-five".