51211667259 has 16 divisors (see below), whose sum is σ = 76605734400. Its totient is φ = 33809642568.

The previous prime is 51211667257. The next prime is 51211667261. The reversal of 51211667259 is 95276611215.

It is a happy number.

51211667259 is a `hidden beast` number, since 512 + 1 + 1 + 66 + 72 + 5 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (51211667257) and next prime (51211667261).

It is not a de Polignac number, because 51211667259 - 2¹ = 51211667257 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (51211667251) 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, 9204639 + ... + 9210200.

It is an arithmetic number, because the mean of its divisors is an integer number (4787858400).

Almost surely, 2^51211667259 is an apocalyptic number.

51211667259 is a deficient number, since it is larger than the sum of its proper divisors (25394067141).

51211667259 is a wasteful number, since it uses less digits than its factorization.

51211667259 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18414951 (or 18414945 counting only the distinct ones).

The product of its digits is 226800, while the sum is 45.

The spelling of 51211667259 in words is "fifty-one billion, two hundred eleven million, six hundred sixty-seven thousand, two hundred fifty-nine".