1643258077061 has 4 divisors (see below), whose sum is σ = 1670196734124. Its totient is φ = 1616319420000.

The previous prime is 1643258077037. The next prime is 1643258077063. The reversal of 1643258077061 is 1607708523461.

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 929729850625 + 713528226436 = 964225^2 + 844706^2 .

It is a cyclic number.

It is not a de Polignac number, because 1643258077061 - 2⁶ = 1643258076997 is a prime.

It is a super-3 number, since 3×1643258077061³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643258077063) 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 3 ways as a sum of consecutive naturals, for example, 13469328440 + ... + 13469328561.

It is an arithmetic number, because the mean of its divisors is an integer number (417549183531).

Almost surely, 2^{1643258077061} is an apocalyptic number.

It is an amenable number.

1643258077061 is a deficient number, since it is larger than the sum of its proper divisors (26938657063).

1643258077061 is an equidigital number, since it uses as much as digits as its factorization.

1643258077061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26938657062.

The product of its (nonzero) digits is 1693440, while the sum is 50.

The spelling of 1643258077061 in words is "one trillion, six hundred forty-three billion, two hundred fifty-eight million, seventy-seven thousand, sixty-one".