643553115154 has 16 divisors (see below), whose sum is σ = 983520686808. Its totient is φ = 315757636992.

The previous prime is 643553115151. The next prime is 643553115157. The reversal of 643553115154 is 451511355346.

It is an interprime number because it is at equal distance from previous prime (643553115151) and next prime (643553115157).

It can be written as a sum of positive squares in 4 ways, for example, as 549103230225 + 94449884929 = 741015^2 + 307327^2 .

It is a super-2 number, since 2×643553115154² (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 643553115154.

It is not an unprimeable number, because it can be changed into a prime (643553115151) 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, 11158797 + ... + 11216320.

Almost surely, 2^643553115154 is an apocalyptic number.

643553115154 is a deficient number, since it is larger than the sum of its proper divisors (339967571654).

643553115154 is a wasteful number, since it uses less digits than its factorization.

643553115154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22375389.

The product of its digits is 540000, while the sum is 43.

The spelling of 643553115154 in words is "six hundred forty-three billion, five hundred fifty-three million, one hundred fifteen thousand, one hundred fifty-four".