643164013061 has 4 divisors (see below), whose sum is σ = 643694240172. Its totient is φ = 642633785952.

The previous prime is 643164013057. The next prime is 643164013091. The reversal of 643164013061 is 160310461346.

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

It can be written as a sum of positive squares in 2 ways, for example, as 222105780961 + 421058232100 = 471281^2 + 648890^2 .

It is a cyclic number.

It is not a de Polignac number, because 643164013061 - 2² = 643164013057 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 (643164013091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265111736 + ... + 265114161.

It is an arithmetic number, because the mean of its divisors is an integer number (160923560043).

Almost surely, 2^643164013061 is an apocalyptic number.

It is an amenable number.

643164013061 is a deficient number, since it is larger than the sum of its proper divisors (530227111).

643164013061 is a wasteful number, since it uses less digits than its factorization.

643164013061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530227110.

The product of its (nonzero) digits is 31104, while the sum is 35.

The spelling of 643164013061 in words is "six hundred forty-three billion, one hundred sixty-four million, thirteen thousand, sixty-one".