51965661 has 8 divisors (see below), whose sum is σ = 75586464. Its totient is φ = 31494320.

The previous prime is 51965633. The next prime is 51965677. The reversal of 51965661 is 16656915.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51965661 - 2¹³ = 51957469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51965621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 787326 + ... + 787391.

It is an arithmetic number, because the mean of its divisors is an integer number (9448308).

Almost surely, 2^51965661 is an apocalyptic number.

It is an amenable number.

51965661 is a deficient number, since it is larger than the sum of its proper divisors (23620803).

51965661 is a wasteful number, since it uses less digits than its factorization.

51965661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1574731.

The product of its digits is 48600, while the sum is 39.

The square root of 51965661 is about 7208.7211764640. The cubic root of 51965661 is about 373.1689368842.

The spelling of 51965661 in words is "fifty-one million, nine hundred sixty-five thousand, six hundred sixty-one".