51220009558 has 4 divisors (see below), whose sum is σ = 76830014340. Its totient is φ = 25610004778.

The previous prime is 51220009553. The next prime is 51220009619. The reversal of 51220009558 is 85590002215.

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

It is a super-2 number, since 2×51220009558² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51220009553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12805002388 + ... + 12805002391.

It is an arithmetic number, because the mean of its divisors is an integer number (19207503585).

Almost surely, 2^51220009558 is an apocalyptic number.

51220009558 is a deficient number, since it is larger than the sum of its proper divisors (25610004782).

51220009558 is a wasteful number, since it uses less digits than its factorization.

51220009558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25610004781.

The product of its (nonzero) digits is 36000, while the sum is 37.

The spelling of 51220009558 in words is "fifty-one billion, two hundred twenty million, nine thousand, five hundred fifty-eight".