51155432505 has 12 divisors (see below), whose sum is σ = 88669416420. Its totient is φ = 27282897312.

The previous prime is 51155432407. The next prime is 51155432507. The reversal of 51155432505 is 50523455115.

51155432505 is a `hidden beast` number, since 5 + 115 + 5 + 4 + 32 + 505 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 28013721129 + 23141711376 = 167373^2 + 152124^2 .

It is not a de Polignac number, because 51155432505 - 2¹² = 51155428409 is a prime.

It is a super-2 number, since 2×51155432505² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51155432505.

It is not an unprimeable number, because it can be changed into a prime (51155432507) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 568393650 + ... + 568393739.

It is an arithmetic number, because the mean of its divisors is an integer number (7389118035).

Almost surely, 2^51155432505 is an apocalyptic number.

It is an amenable number.

51155432505 is a deficient number, since it is larger than the sum of its proper divisors (37513983915).

51155432505 is a wasteful number, since it uses less digits than its factorization.

51155432505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1136787400 (or 1136787397 counting only the distinct ones).

The product of its (nonzero) digits is 75000, while the sum is 36.

The spelling of 51155432505 in words is "fifty-one billion, one hundred fifty-five million, four hundred thirty-two thousand, five hundred five".