646771672445042 has 8 divisors (see below), whose sum is σ = 970158103365036. Its totient is φ = 323385637990032.

The previous prime is 646771672445033. The next prime is 646771672445131. The reversal of 646771672445042 is 240544276177646.

It can be written as a sum of positive squares in 2 ways, for example, as 637074308989561 + 9697363455481 = 25240331^2 + 3114059^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 646771672445042.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95003753 + ... + 101583740.

Almost surely, 2^{646771672445042} is an apocalyptic number.

646771672445042 is a deficient number, since it is larger than the sum of its proper divisors (323386430919994).

646771672445042 is a wasteful number, since it uses less digits than its factorization.

646771672445042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198232492.

The product of its (nonzero) digits is 379330560, while the sum is 65.

The spelling of 646771672445042 in words is "six hundred forty-six trillion, seven hundred seventy-one billion, six hundred seventy-two million, four hundred forty-five thousand, forty-two".