51662207215 has 4 divisors (see below), whose sum is σ = 61994648664. Its totient is φ = 41329765768.

The previous prime is 51662207213. The next prime is 51662207243. The reversal of 51662207215 is 51270226615.

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

It is a cyclic number.

It is not a de Polignac number, because 51662207215 - 2¹ = 51662207213 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 (51662207213) 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, 5166220717 + ... + 5166220726.

It is an arithmetic number, because the mean of its divisors is an integer number (15498662166).

Almost surely, 2^51662207215 is an apocalyptic number.

51662207215 is a deficient number, since it is larger than the sum of its proper divisors (10332441449).

51662207215 is a wasteful number, since it uses less digits than its factorization.

51662207215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10332441448.

The product of its (nonzero) digits is 50400, while the sum is 37.

The spelling of 51662207215 in words is "fifty-one billion, six hundred sixty-two million, two hundred seven thousand, two hundred fifteen".