51500535497 has 4 divisors (see below), whose sum is σ = 52000540800. Its totient is φ = 51000530196.

The previous prime is 51500535439. The next prime is 51500535509. The reversal of 51500535497 is 79453500515.

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 51500535497 - 2⁶ = 51500535433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51500535407) 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, 250002497 + ... + 250002702.

It is an arithmetic number, because the mean of its divisors is an integer number (13000135200).

Almost surely, 2^51500535497 is an apocalyptic number.

It is an amenable number.

51500535497 is a deficient number, since it is larger than the sum of its proper divisors (500005303).

51500535497 is a wasteful number, since it uses less digits than its factorization.

51500535497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500005302.

The product of its (nonzero) digits is 472500, while the sum is 44.

The spelling of 51500535497 in words is "fifty-one billion, five hundred million, five hundred thirty-five thousand, four hundred ninety-seven".