51666402 has 16 divisors (see below), whose sum is σ = 103859712. Its totient is φ = 17134320.

The previous prime is 51666401. The next prime is 51666403. The reversal of 51666402 is 20466615.

51666402 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51666401) and next prime (51666403).

It is a self number, because there is not a number n which added to its sum of digits gives 51666402.

It is not an unprimeable number, because it can be changed into a prime (51666401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20674 + ... + 23037.

It is an arithmetic number, because the mean of its divisors is an integer number (6491232).

Almost surely, 2^51666402 is an apocalyptic number.

51666402 is an abundant number, since it is smaller than the sum of its proper divisors (52193310).

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

51666402 is a wasteful number, since it uses less digits than its factorization.

51666402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43913.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 51666402 is about 7187.9344738249. The cubic root of 51666402 is about 372.4512243389.

The spelling of 51666402 in words is "fifty-one million, six hundred sixty-six thousand, four hundred two".