643174480551 has 4 divisors (see below), whose sum is σ = 857565974072. Its totient is φ = 428782987032.

The previous prime is 643174480489. The next prime is 643174480561. The reversal of 643174480551 is 155084471346.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 643174480551 - 2¹⁷ = 643174349479 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 643174480551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643174480561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107195746756 + ... + 107195746761.

It is an arithmetic number, because the mean of its divisors is an integer number (214391493518).

Almost surely, 2^643174480551 is an apocalyptic number.

643174480551 is a deficient number, since it is larger than the sum of its proper divisors (214391493521).

643174480551 is a wasteful number, since it uses less digits than its factorization.

643174480551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214391493520.

The product of its (nonzero) digits is 1612800, while the sum is 48.

The spelling of 643174480551 in words is "six hundred forty-three billion, one hundred seventy-four million, four hundred eighty thousand, five hundred fifty-one".