51117155727 has 16 divisors (see below), whose sum is σ = 74372722560. Its totient is φ = 30971554400.

The previous prime is 51117155711. The next prime is 51117155731. The reversal of 51117155727 is 72755171115.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 51117155727 - 2⁴ = 51117155711 is a prime.

It is a super-2 number, since 2×51117155727² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51117155707) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90924 + ... + 332417.

It is an arithmetic number, because the mean of its divisors is an integer number (4648295160).

Almost surely, 2^51117155727 is an apocalyptic number.

51117155727 is a deficient number, since it is larger than the sum of its proper divisors (23255566833).

51117155727 is a wasteful number, since it uses less digits than its factorization.

51117155727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427014.

The product of its digits is 85750, while the sum is 42.

The spelling of 51117155727 in words is "fifty-one billion, one hundred seventeen million, one hundred fifty-five thousand, seven hundred twenty-seven".