51312277667 has 16 divisors (see below), whose sum is σ = 61802764800. Its totient is φ = 41617359360.

The previous prime is 51312277663. The next prime is 51312277691. The reversal of 51312277667 is 76677221315.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 51312277667 - 2² = 51312277663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51312277663) 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, 118334 + ... + 341507.

It is an arithmetic number, because the mean of its divisors is an integer number (3862672800).

Almost surely, 2^51312277667 is an apocalyptic number.

51312277667 is a deficient number, since it is larger than the sum of its proper divisors (10490487133).

51312277667 is a wasteful number, since it uses less digits than its factorization.

51312277667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460706.

The product of its digits is 740880, while the sum is 47.

The spelling of 51312277667 in words is "fifty-one billion, three hundred twelve million, two hundred seventy-seven thousand, six hundred sixty-seven".