516581646 has 16 divisors (see below), whose sum is σ = 1180758144. Its totient is φ = 147594744.

The previous prime is 516581641. The next prime is 516581651. The reversal of 516581646 is 646185615.

It is an interprime number because it is at equal distance from previous prime (516581641) and next prime (516581651).

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 12299563 = 516581646 / (5 + 1 + 6 + 5 + 8 + 1 + 6 + 4 + 6).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 516581598 and 516581607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (516581641) 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, 6149740 + ... + 6149823.

It is an arithmetic number, because the mean of its divisors is an integer number (73797384).

Almost surely, 2^516581646 is an apocalyptic number.

516581646 is an abundant number, since it is smaller than the sum of its proper divisors (664176498).

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

516581646 is a wasteful number, since it uses less digits than its factorization.

516581646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12299575.

The product of its digits is 172800, while the sum is 42.

The square root of 516581646 is about 22728.4325460424. The cubic root of 516581646 is about 802.3791912552.

The spelling of 516581646 in words is "five hundred sixteen million, five hundred eighty-one thousand, six hundred forty-six".