51511171606 has 32 divisors (see below), whose sum is σ = 82245240000. Its totient is φ = 24112346112.

The previous prime is 51511171603. The next prime is 51511171609. The reversal of 51511171606 is 60617111515.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51511171603) and next prime (51511171609).

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51511171603) 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, 10890250 + ... + 10894978.

It is an arithmetic number, because the mean of its divisors is an integer number (2570163750).

Almost surely, 2^51511171606 is an apocalyptic number.

51511171606 is a deficient number, since it is larger than the sum of its proper divisors (30734068394).

51511171606 is a wasteful number, since it uses less digits than its factorization.

51511171606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6376.

The product of its (nonzero) digits is 6300, while the sum is 34.

The spelling of 51511171606 in words is "fifty-one billion, five hundred eleven million, one hundred seventy-one thousand, six hundred six".