646177761043 has 4 divisors (see below), whose sum is σ = 648858996808. Its totient is φ = 643496525280.

The previous prime is 646177761029. The next prime is 646177761107. The reversal of 646177761043 is 340167771646.

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

It is a cyclic number.

It is not a de Polignac number, because 646177761043 - 2¹³ = 646177752851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646177761743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1340617521 + ... + 1340618002.

It is an arithmetic number, because the mean of its divisors is an integer number (162214749202).

Almost surely, 2^646177761043 is an apocalyptic number.

646177761043 is a deficient number, since it is larger than the sum of its proper divisors (2681235765).

646177761043 is a wasteful number, since it uses less digits than its factorization.

646177761043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2681235764.

The product of its (nonzero) digits is 3556224, while the sum is 52.

The spelling of 646177761043 in words is "six hundred forty-six billion, one hundred seventy-seven million, seven hundred sixty-one thousand, forty-three".