643131533261046 has 32 divisors (see below), whose sum is σ = 1287117106500960. Its totient is φ = 214234854402816.

The previous prime is 643131533261029. The next prime is 643131533261051. The reversal of 643131533261046 is 640162335131346.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 643131533260986 and 643131533261004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 153114840 + ... + 157259076.

It is an arithmetic number, because the mean of its divisors is an integer number (40222409578155).

Almost surely, 2^{643131533261046} is an apocalyptic number.

643131533261046 is an abundant number, since it is smaller than the sum of its proper divisors (643985573239914).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643131533261046 is a wasteful number, since it uses less digits than its factorization.

643131533261046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4161408.

The product of its (nonzero) digits is 2799360, while the sum is 48.

The spelling of 643131533261046 in words is "six hundred forty-three trillion, one hundred thirty-one billion, five hundred thirty-three million, two hundred sixty-one thousand, forty-six".