651202194840 has 128 divisors (see below), whose sum is σ = 2009176565760. Its totient is φ = 168727325184.

The previous prime is 651202194817. The next prime is 651202194869. The reversal of 651202194840 is 48491202156.

It is a Cunningham number, because it is equal to 806971²-1.

It is a junction number, because it is equal to n+sod(n) for n = 651202194792 and 651202194801.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 3127009 + ... + 3328751.

It is an arithmetic number, because the mean of its divisors is an integer number (15696691920).

Almost surely, 2^651202194840 is an apocalyptic number.

651202194840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 651202194840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1004588282880).

651202194840 is an abundant number, since it is smaller than the sum of its proper divisors (1357974370920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

651202194840 is a wasteful number, since it uses less digits than its factorization.

651202194840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202521 (or 202517 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 42.

Adding to 651202194840 its reverse (48491202156), we get a palindrome (699693396996).

The spelling of 651202194840 in words is "six hundred fifty-one billion, two hundred two million, one hundred ninety-four thousand, eight hundred forty".