51142112505 has 80 divisors (see below), whose sum is σ = 100374715584. Its totient is φ = 24706062720.

The previous prime is 51142112471. The next prime is 51142112531. The reversal of 51142112505 is 50521124115.

It is a happy number.

51142112505 is a `hidden beast` number, since 5 + 1 + 1 + 42 + 112 + 505 = 666.

It is not a de Polignac number, because 51142112505 - 2¹¹ = 51142110457 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1213314 + ... + 1254756.

Almost surely, 2^51142112505 is an apocalyptic number.

51142112505 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51142112505 is a deficient number, since it is larger than the sum of its proper divisors (49232603079).

51142112505 is a wasteful number, since it uses less digits than its factorization.

51142112505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41748 (or 41739 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

The spelling of 51142112505 in words is "fifty-one billion, one hundred forty-two million, one hundred twelve thousand, five hundred five".