643550277154 has 4 divisors (see below), whose sum is σ = 965325415734. Its totient is φ = 321775138576.

The previous prime is 643550277037. The next prime is 643550277157. The reversal of 643550277154 is 451772055346.

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

It can be written as a sum of positive squares in only one way, i.e., 356068791225 + 287481485929 = 596715^2 + 536173^2 .

It is a junction number, because it is equal to n+sod(n) for n = 643550277098 and 643550277107.

It is not an unprimeable number, because it can be changed into a prime (643550277157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160887569287 + ... + 160887569290.

Almost surely, 2^643550277154 is an apocalyptic number.

643550277154 is a deficient number, since it is larger than the sum of its proper divisors (321775138580).

643550277154 is a wasteful number, since it uses less digits than its factorization.

643550277154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321775138579.

The product of its (nonzero) digits is 3528000, while the sum is 49.

The spelling of 643550277154 in words is "six hundred forty-three billion, five hundred fifty million, two hundred seventy-seven thousand, one hundred fifty-four".