51121217667 has 16 divisors (see below), whose sum is σ = 77722757280. Its totient is φ = 29608668672.

The previous prime is 51121217621. The next prime is 51121217687. The reversal of 51121217667 is 76671212115.

It is not a de Polignac number, because 51121217667 - 2¹¹ = 51121215619 is a prime.

It is a super-2 number, since 2×51121217667² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (51121217687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38552292 + ... + 38553617.

It is an arithmetic number, because the mean of its divisors is an integer number (4857672330).

Almost surely, 2^51121217667 is an apocalyptic number.

51121217667 is a deficient number, since it is larger than the sum of its proper divisors (26601539613).

51121217667 is a wasteful number, since it uses less digits than its factorization.

51121217667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77105942.

The product of its digits is 35280, while the sum is 39.

The spelling of 51121217667 in words is "fifty-one billion, one hundred twenty-one million, two hundred seventeen thousand, six hundred sixty-seven".