51662256511 has 4 divisors (see below), whose sum is σ = 53058533752. Its totient is φ = 50265979272.

The previous prime is 51662256497. The next prime is 51662256533. The reversal of 51662256511 is 11565226615.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11565226615 = 5 ⋅2313045323.

It is a cyclic number.

It is not a de Polignac number, because 51662256511 - 2⁹ = 51662255999 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 (51662256011) 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, 698138565 + ... + 698138638.

It is an arithmetic number, because the mean of its divisors is an integer number (13264633438).

Almost surely, 2^51662256511 is an apocalyptic number.

51662256511 is a deficient number, since it is larger than the sum of its proper divisors (1396277241).

51662256511 is a wasteful number, since it uses less digits than its factorization.

51662256511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1396277240.

The product of its digits is 108000, while the sum is 40.

The spelling of 51662256511 in words is "fifty-one billion, six hundred sixty-two million, two hundred fifty-six thousand, five hundred eleven".