51661015 has 16 divisors (see below), whose sum is σ = 70966080. Its totient is φ = 35366400.

The previous prime is 51661003. The next prime is 51661063. The reversal of 51661015 is 51016615.

It is a de Polignac number, because none of the positive numbers 2^k-51661015 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41421 + ... + 42649.

It is an arithmetic number, because the mean of its divisors is an integer number (4435380).

Almost surely, 2^51661015 is an apocalyptic number.

51661015 is a deficient number, since it is larger than the sum of its proper divisors (19305065).

51661015 is a wasteful number, since it uses less digits than its factorization.

51661015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2442.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 51661015 is about 7187.5597388822. The cubic root of 51661015 is about 372.4382793404.

The spelling of 51661015 in words is "fifty-one million, six hundred sixty-one thousand, fifteen".