680644890050545 has 16 divisors (see below), whose sum is σ = 933456588842880. Its totient is φ = 466727554790784.

The previous prime is 680644890050441. The next prime is 680644890050549. The reversal of 680644890050545 is 545050098446086.

It is a happy number.

It is not a de Polignac number, because 680644890050545 - 2¹⁷ = 680644889919473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (680644890050549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41529861 + ... + 55551949.

It is an arithmetic number, because the mean of its divisors is an integer number (58341036802680).

Almost surely, 2^{680644890050545} is an apocalyptic number.

It is an amenable number.

680644890050545 is a deficient number, since it is larger than the sum of its proper divisors (252811698792335).

680644890050545 is a wasteful number, since it uses less digits than its factorization.

680644890050545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15408984.

The product of its (nonzero) digits is 165888000, while the sum is 64.

The spelling of 680644890050545 in words is "six hundred eighty trillion, six hundred forty-four billion, eight hundred ninety million, fifty thousand, five hundred forty-five".