51661416 has 16 divisors (see below), whose sum is σ = 129153600. Its totient is φ = 17220464.

The previous prime is 51661411. The next prime is 51661457. The reversal of 51661416 is 61416615.

It is not an unprimeable number, because it can be changed into a prime (51661411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1076256 + ... + 1076303.

It is an arithmetic number, because the mean of its divisors is an integer number (8072100).

Almost surely, 2^51661416 is an apocalyptic number.

It is an amenable number.

51661416 is an abundant number, since it is smaller than the sum of its proper divisors (77492184).

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

51661416 is a wasteful number, since it uses less digits than its factorization.

51661416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2152568 (or 2152564 counting only the distinct ones).

The product of its digits is 4320, while the sum is 30.

The square root of 51661416 is about 7187.5876342484. The cubic root of 51661416 is about 372.4392429772.

The spelling of 51661416 in words is "fifty-one million, six hundred sixty-one thousand, four hundred sixteen".