51661326 has 16 divisors (see below), whose sum is σ = 105272784. Its totient is φ = 16895424.

The previous prime is 51661307. The next prime is 51661333. The reversal of 51661326 is 62316615.

It is a junction number, because it is equal to n+sod(n) for n = 51661293 and 51661302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80911 + ... + 81546.

It is an arithmetic number, because the mean of its divisors is an integer number (6579549).

Almost surely, 2^51661326 is an apocalyptic number.

51661326 is an abundant number, since it is smaller than the sum of its proper divisors (53611458).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51661326 is a wasteful number, since it uses less digits than its factorization.

51661326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162515.

The product of its digits is 6480, while the sum is 30.

The square root of 51661326 is about 7187.5813734524. The cubic root of 51661326 is about 372.4390267001.

The spelling of 51661326 in words is "fifty-one million, six hundred sixty-one thousand, three hundred twenty-six".