51815201405 has 48 divisors (see below), whose sum is σ = 70205026752. Its totient is φ = 36671712000.

The previous prime is 51815201401. The next prime is 51815201429. The reversal of 51815201405 is 50410251815.

51815201405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51815201405 - 2² = 51815201401 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51815201401) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3356705 + ... + 3372105.

It is an arithmetic number, because the mean of its divisors is an integer number (1462604724).

Almost surely, 2^51815201405 is an apocalyptic number.

51815201405 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51815201405 is a deficient number, since it is larger than the sum of its proper divisors (18389825347).

51815201405 is a wasteful number, since it uses less digits than its factorization.

51815201405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15578 (or 15567 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 32.

The spelling of 51815201405 in words is "fifty-one billion, eight hundred fifteen million, two hundred one thousand, four hundred five".