51520002166651 has 4 divisors (see below), whose sum is σ = 51520061868472. Its totient is φ = 51519942464832.

The previous prime is 51520002166639. The next prime is 51520002166691. The reversal of 51520002166651 is 15666120002515.

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 51520002166651 - 2²⁵ = 51519968612219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51520002166691) 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, 28537206 + ... + 30288811.

It is an arithmetic number, because the mean of its divisors is an integer number (12880015467118).

Almost surely, 2^{51520002166651} is an apocalyptic number.

51520002166651 is a deficient number, since it is larger than the sum of its proper divisors (59701821).

51520002166651 is an equidigital number, since it uses as much as digits as its factorization.

51520002166651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59701820.

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

The spelling of 51520002166651 in words is "fifty-one trillion, five hundred twenty billion, two million, one hundred sixty-six thousand, six hundred fifty-one".