649740198371 has 16 divisors (see below), whose sum is σ = 720566136576. Its totient is φ = 580951500000.

The previous prime is 649740198311. The next prime is 649740198403. The reversal of 649740198371 is 173891047946.

It is a cyclic number.

It is not a de Polignac number, because 649740198371 - 2⁶ = 649740198307 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 649740198371.

It is not an unprimeable number, because it can be changed into a prime (649740198311) 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 15 ways as a sum of consecutive naturals, for example, 1768745 + ... + 2104266.

It is an arithmetic number, because the mean of its divisors is an integer number (45035383536).

Almost surely, 2^649740198371 is an apocalyptic number.

649740198371 is a deficient number, since it is larger than the sum of its proper divisors (70825938205).

649740198371 is a wasteful number, since it uses less digits than its factorization.

649740198371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3873274.

The product of its (nonzero) digits is 9144576, while the sum is 59.

The spelling of 649740198371 in words is "six hundred forty-nine billion, seven hundred forty million, one hundred ninety-eight thousand, three hundred seventy-one".