51155800905 has 16 divisors (see below), whose sum is σ = 89290125504. Its totient is φ = 24802812480.

The previous prime is 51155800867. The next prime is 51155800919. The reversal of 51155800905 is 50900855115.

It is not a de Polignac number, because 51155800905 - 2⁸ = 51155800649 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155017414 + ... + 155017743.

It is an arithmetic number, because the mean of its divisors is an integer number (5580632844).

Almost surely, 2^51155800905 is an apocalyptic number.

51155800905 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51155800905 is a deficient number, since it is larger than the sum of its proper divisors (38134324599).

51155800905 is a wasteful number, since it uses less digits than its factorization.

51155800905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310035176.

The product of its (nonzero) digits is 45000, while the sum is 39.

The spelling of 51155800905 in words is "fifty-one billion, one hundred fifty-five million, eight hundred thousand, nine hundred five".