646653041402 has 16 divisors (see below), whose sum is σ = 1010161557000. Its totient is φ = 310082176320.

The previous prime is 646653041401. The next prime is 646653041407. The reversal of 646653041402 is 204140356646.

It can be written as a sum of positive squares in 4 ways, for example, as 413874775561 + 232778265841 = 643331^2 + 482471^2 .

It is a super-2 number, since 2×646653041402² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 646653041402.

It is not an unprimeable number, because it can be changed into a prime (646653041401) 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, 37404749 + ... + 37422032.

Almost surely, 2^646653041402 is an apocalyptic number.

646653041402 is a deficient number, since it is larger than the sum of its proper divisors (363508515598).

646653041402 is a wasteful number, since it uses less digits than its factorization.

646653041402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74826961.

The product of its (nonzero) digits is 414720, while the sum is 41.

The spelling of 646653041402 in words is "six hundred forty-six billion, six hundred fifty-three million, forty-one thousand, four hundred two".