51661670 has 16 divisors (see below), whose sum is σ = 93089520. Its totient is φ = 20642784.

The previous prime is 51661669. The next prime is 51661699. The reversal of 51661670 is 7616615.

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, 10001 + ... + 14259.

It is an arithmetic number, because the mean of its divisors is an integer number (5818095).

Almost surely, 2^51661670 is an apocalyptic number.

51661670 is a deficient number, since it is larger than the sum of its proper divisors (41427850).

51661670 is a wasteful number, since it uses less digits than its factorization.

51661670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5479.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 51661670 is about 7187.6053035764. The cubic root of 51661670 is about 372.4398533580.

The spelling of 51661670 in words is "fifty-one million, six hundred sixty-one thousand, six hundred seventy".