651420031543 has 4 divisors (see below), whose sum is σ = 651423251160. Its totient is φ = 651416811928.

The previous prime is 651420031501. The next prime is 651420031627. The reversal of 651420031543 is 345130024156.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-651420031543 is a prime.

It is a super-2 number, since 2×651420031543² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 651420031499 and 651420031508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651420031343) 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, 1284388 + ... + 1718281.

It is an arithmetic number, because the mean of its divisors is an integer number (162855812790).

Almost surely, 2^651420031543 is an apocalyptic number.

651420031543 is a deficient number, since it is larger than the sum of its proper divisors (3219617).

651420031543 is a wasteful number, since it uses less digits than its factorization.

651420031543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3219616.

The product of its (nonzero) digits is 43200, while the sum is 34.

Adding to 651420031543 its reverse (345130024156), we get a palindrome (996550055699).

The spelling of 651420031543 in words is "six hundred fifty-one billion, four hundred twenty million, thirty-one thousand, five hundred forty-three".