643142251115 has 64 divisors (see below), whose sum is σ = 981427249152. Its totient is φ = 393780441600.

The previous prime is 643142251067. The next prime is 643142251121. The reversal of 643142251115 is 511152241346.

It is a happy number.

It is not a de Polignac number, because 643142251115 - 2¹⁸ = 643141988971 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1524350 + ... + 1899980.

It is an arithmetic number, because the mean of its divisors is an integer number (15334800768).

Almost surely, 2^643142251115 is an apocalyptic number.

643142251115 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

643142251115 is a deficient number, since it is larger than the sum of its proper divisors (338284998037).

643142251115 is a wasteful number, since it uses less digits than its factorization.

643142251115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375780.

The product of its digits is 28800, while the sum is 35.

The spelling of 643142251115 in words is "six hundred forty-three billion, one hundred forty-two million, two hundred fifty-one thousand, one hundred fifteen".