51620165 has 8 divisors (see below), whose sum is σ = 64637568. Its totient is φ = 39500560.

The previous prime is 51620161. The next prime is 51620197. The reversal of 51620165 is 56102615.

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

It is not a de Polignac number, because 51620165 - 2² = 51620161 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51620161) 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, 224321 + ... + 224550.

It is an arithmetic number, because the mean of its divisors is an integer number (8079696).

Almost surely, 2^51620165 is an apocalyptic number.

It is an amenable number.

51620165 is a deficient number, since it is larger than the sum of its proper divisors (13017403).

51620165 is a wasteful number, since it uses less digits than its factorization.

51620165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448899.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 51620165 is about 7184.7174613898. The cubic root of 51620165 is about 372.3400872087.

The spelling of 51620165 in words is "fifty-one million, six hundred twenty thousand, one hundred sixty-five".