51505515501001 has 4 divisors (see below), whose sum is σ = 51507776223232. Its totient is φ = 51503254778772.

The previous prime is 51505515500981. The next prime is 51505515501017. The reversal of 51505515501001 is 10010551550515.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51505515501001 - 2⁹ = 51505515500489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51505515501091) 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, 1130326941 + ... + 1130372506.

It is an arithmetic number, because the mean of its divisors is an integer number (12876944055808).

Almost surely, 2^{51505515501001} is an apocalyptic number.

It is an amenable number.

51505515501001 is a deficient number, since it is larger than the sum of its proper divisors (2260722231).

51505515501001 is a wasteful number, since it uses less digits than its factorization.

51505515501001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2260722230.

The product of its (nonzero) digits is 15625, while the sum is 34.

The spelling of 51505515501001 in words is "fifty-one trillion, five hundred five billion, five hundred fifteen million, five hundred one thousand, one".