643142039404877 has 32 divisors (see below), whose sum is σ = 667077227762400. Its totient is φ = 619617825587200.

The previous prime is 643142039404847. The next prime is 643142039404961. The reversal of 643142039404877 is 778404930241346.

It can be written as a sum of positive squares in 16 ways, for example, as 603409452587236 + 39732586817641 = 24564394^2 + 6303379^2 .

It is a cyclic number.

It is not a de Polignac number, because 643142039404877 - 2²⁸ = 643141770969421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643142039404847) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 21088683293 + ... + 21088713789.

It is an arithmetic number, because the mean of its divisors is an integer number (20846163367575).

Almost surely, 2^{643142039404877} is an apocalyptic number.

It is an amenable number.

643142039404877 is a deficient number, since it is larger than the sum of its proper divisors (23935188357523).

643142039404877 is a wasteful number, since it uses less digits than its factorization.

643142039404877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37777.

The product of its (nonzero) digits is 97542144, while the sum is 62.

The spelling of 643142039404877 in words is "six hundred forty-three trillion, one hundred forty-two billion, thirty-nine million, four hundred four thousand, eight hundred seventy-seven".