646500643455 has 32 divisors (see below), whose sum is σ = 1120719055104. Its totient is φ = 316971035136.

The previous prime is 646500643441. The next prime is 646500643469. The reversal of 646500643455 is 554346005646.

It is an interprime number because it is at equal distance from previous prime (646500643441) and next prime (646500643469).

It is not a de Polignac number, because 646500643455 - 2⁵ = 646500643423 is a prime.

It is a super-3 number, since 3×646500643455³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29469229 + ... + 29491158.

It is an arithmetic number, because the mean of its divisors is an integer number (35022470472).

Almost surely, 2^646500643455 is an apocalyptic number.

646500643455 is a deficient number, since it is larger than the sum of its proper divisors (474218411649).

646500643455 is a wasteful number, since it uses less digits than its factorization.

646500643455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58960455.

The product of its (nonzero) digits is 5184000, while the sum is 48.

The spelling of 646500643455 in words is "six hundred forty-six billion, five hundred million, six hundred forty-three thousand, four hundred fifty-five".