51017502667 has 4 divisors (see below), whose sum is σ = 51663293920. Its totient is φ = 50371711416.

The previous prime is 51017502659. The next prime is 51017502671. The reversal of 51017502667 is 76620571015.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51017502667 - 2³ = 51017502659 is a prime.

It is a super-2 number, since 2×51017502667² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51017502967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 322895508 + ... + 322895665.

It is an arithmetic number, because the mean of its divisors is an integer number (12915823480).

Almost surely, 2^51017502667 is an apocalyptic number.

51017502667 is a deficient number, since it is larger than the sum of its proper divisors (645791253).

51017502667 is an equidigital number, since it uses as much as digits as its factorization.

51017502667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645791252.

The product of its (nonzero) digits is 88200, while the sum is 40.

The spelling of 51017502667 in words is "fifty-one billion, seventeen million, five hundred two thousand, six hundred sixty-seven".