51220145204 has 12 divisors (see below), whose sum is σ = 94352899200. Its totient is φ = 24262174008.

The previous prime is 51220145131. The next prime is 51220145239. The reversal of 51220145204 is 40254102215.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 336974564 + ... + 336974715.

It is an arithmetic number, because the mean of its divisors is an integer number (7862741600).

Almost surely, 2^51220145204 is an apocalyptic number.

It is an amenable number.

51220145204 is a deficient number, since it is larger than the sum of its proper divisors (43132753996).

51220145204 is a wasteful number, since it uses less digits than its factorization.

51220145204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673949302 (or 673949300 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 26.

Adding to 51220145204 its reverse (40254102215), we get a palindrome (91474247419).

The spelling of 51220145204 in words is "fifty-one billion, two hundred twenty million, one hundred forty-five thousand, two hundred four".