51522999142 has 4 divisors (see below), whose sum is σ = 77284498716. Its totient is φ = 25761499570.

The previous prime is 51522999137. The next prime is 51522999149. The reversal of 51522999142 is 24199922515.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51522999149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12880749784 + ... + 12880749787.

It is an arithmetic number, because the mean of its divisors is an integer number (19321124679).

Almost surely, 2^51522999142 is an apocalyptic number.

51522999142 is a deficient number, since it is larger than the sum of its proper divisors (25761499574).

51522999142 is a wasteful number, since it uses less digits than its factorization.

51522999142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25761499573.

The product of its digits is 583200, while the sum is 49.

The spelling of 51522999142 in words is "fifty-one billion, five hundred twenty-two million, nine hundred ninety-nine thousand, one hundred forty-two".