51355512501 has 4 divisors (see below), whose sum is σ = 68474016672. Its totient is φ = 34237008332.

The previous prime is 51355512499. The next prime is 51355512587. The reversal of 51355512501 is 10521555315.

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 51355512501 - 2¹ = 51355512499 is a prime.

It is a super-3 number, since 3×51355512501³ (a number of 33 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51355512001) 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, 8559252081 + ... + 8559252086.

It is an arithmetic number, because the mean of its divisors is an integer number (17118504168).

Almost surely, 2^51355512501 is an apocalyptic number.

It is an amenable number.

51355512501 is a deficient number, since it is larger than the sum of its proper divisors (17118504171).

51355512501 is a wasteful number, since it uses less digits than its factorization.

51355512501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17118504170.

The product of its (nonzero) digits is 18750, while the sum is 33.

The spelling of 51355512501 in words is "fifty-one billion, three hundred fifty-five million, five hundred twelve thousand, five hundred one".