51501222399 has 16 divisors (see below), whose sum is σ = 74915193600. Its totient is φ = 31211060160.

The previous prime is 51501222391. The next prime is 51501222401. The reversal of 51501222399 is 99322210515.

It is not a de Polignac number, because 51501222399 - 2³ = 51501222391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51501222391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 738819 + ... + 805515.

It is an arithmetic number, because the mean of its divisors is an integer number (4682199600).

Almost surely, 2^51501222399 is an apocalyptic number.

51501222399 is a deficient number, since it is larger than the sum of its proper divisors (23413971201).

51501222399 is a wasteful number, since it uses less digits than its factorization.

51501222399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90110.

The product of its (nonzero) digits is 48600, while the sum is 39.

The spelling of 51501222399 in words is "fifty-one billion, five hundred one million, two hundred twenty-two thousand, three hundred ninety-nine".