451643633402678 has 16 divisors (see below), whose sum is σ = 677666681605536. Its totient is φ = 225754740619200.

The previous prime is 451643633402677. The next prime is 451643633402719. The reversal of 451643633402678 is 876204336346154.

It is a happy number.

It is a Smith number, since the sum of its digits (62) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 451643633402678.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (451643633402677) 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, 1269364850 + ... + 1269720602.

It is an arithmetic number, because the mean of its divisors is an integer number (42354167600346).

Almost surely, 2^{451643633402678} is an apocalyptic number.

451643633402678 is a deficient number, since it is larger than the sum of its proper divisors (226023048202858).

451643633402678 is a wasteful number, since it uses less digits than its factorization.

451643633402678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542519.

The product of its (nonzero) digits is 209018880, while the sum is 62.

The spelling of 451643633402678 in words is "four hundred fifty-one trillion, six hundred forty-three billion, six hundred thirty-three million, four hundred two thousand, six hundred seventy-eight".