651405404623 has 6 divisors (see below), whose sum is σ = 653050515336. Its totient is φ = 649764427752.

The previous prime is 651405404567. The next prime is 651405404633. The reversal of 651405404623 is 326404504156.

It is not a de Polignac number, because 651405404623 - 2¹⁷ = 651405273551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651405404633) 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 5 ways as a sum of consecutive naturals, for example, 1908915 + ... + 2224132.

It is an arithmetic number, because the mean of its divisors is an integer number (108841752556).

Almost surely, 2^651405404623 is an apocalyptic number.

651405404623 is a deficient number, since it is larger than the sum of its proper divisors (1645110713).

651405404623 is an frugal number, since it uses more digits than its factorization.

651405404623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4133841 (or 4133444 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 40.

Adding to 651405404623 its reverse (326404504156), we get a palindrome (977809908779).

The spelling of 651405404623 in words is "six hundred fifty-one billion, four hundred five million, four hundred four thousand, six hundred twenty-three".