51223664651 has 4 divisors (see below), whose sum is σ = 51227182704. Its totient is φ = 51220146600.

The previous prime is 51223664641. The next prime is 51223664659. The reversal of 51223664651 is 15646632215.

It is a happy number.

51223664651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15646632215 = 5 ⋅3129326443.

It is a cyclic number.

It is not a de Polignac number, because 51223664651 - 2¹⁰ = 51223663627 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51223664599 and 51223664608.

It is not an unprimeable number, because it can be changed into a prime (51223664659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1737095 + ... + 1766336.

It is an arithmetic number, because the mean of its divisors is an integer number (12806795676).

Almost surely, 2^51223664651 is an apocalyptic number.

51223664651 is a deficient number, since it is larger than the sum of its proper divisors (3518053).

51223664651 is a wasteful number, since it uses less digits than its factorization.

51223664651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3518052.

The product of its digits is 259200, while the sum is 41.

The spelling of 51223664651 in words is "fifty-one billion, two hundred twenty-three million, six hundred sixty-four thousand, six hundred fifty-one".