646346520143655 has 8 divisors (see below), whose sum is σ = 1034154432229872. Its totient is φ = 344718144076608.

The previous prime is 646346520143647. The next prime is 646346520143767. The reversal of 646346520143655 is 556341025643646.

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

It is not a de Polignac number, because 646346520143655 - 2³ = 646346520143647 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21544884004774 + ... + 21544884004803.

It is an arithmetic number, because the mean of its divisors is an integer number (129269304028734).

Almost surely, 2^{646346520143655} is an apocalyptic number.

646346520143655 is a deficient number, since it is larger than the sum of its proper divisors (387807912086217).

646346520143655 is a wasteful number, since it uses less digits than its factorization.

646346520143655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43089768009585.

The product of its (nonzero) digits is 186624000, while the sum is 60.

The spelling of 646346520143655 in words is "six hundred forty-six trillion, three hundred forty-six billion, five hundred twenty million, one hundred forty-three thousand, six hundred fifty-five".