51213355642540 has 96 divisors (see below), whose sum is σ = 139333502085120. Its totient is φ = 15355120617216.

The previous prime is 51213355642429. The next prime is 51213355642543. The reversal of 51213355642540 is 4524655331215.

It is not an unprimeable number, because it can be changed into a prime (51213355642543) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 740470852 + ... + 740540011.

It is an arithmetic number, because the mean of its divisors is an integer number (1451390646720).

Almost surely, 2^{51213355642540} is an apocalyptic number.

It is an amenable number.

51213355642540 is an abundant number, since it is smaller than the sum of its proper divisors (88120146442580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51213355642540 is a wasteful number, since it uses less digits than its factorization.

51213355642540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1481010911 (or 1481010909 counting only the distinct ones).

The product of its (nonzero) digits is 2160000, while the sum is 46.

The spelling of 51213355642540 in words is "fifty-one trillion, two hundred thirteen billion, three hundred fifty-five million, six hundred forty-two thousand, five hundred forty".