511661616 has 40 divisors (see below), whose sum is σ = 1367375280. Its totient is φ = 164672256.

The previous prime is 511661581. The next prime is 511661651. The reversal of 511661616 is 616166115.

It is an interprime number because it is at equal distance from previous prime (511661581) and next prime (511661651).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182395 + ... + 185178.

It is an arithmetic number, because the mean of its divisors is an integer number (34184382).

Almost surely, 2^511661616 is an apocalyptic number.

It is an amenable number.

511661616 is an abundant number, since it is smaller than the sum of its proper divisors (855713664).

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

511661616 is a wasteful number, since it uses less digits than its factorization.

511661616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367613 (or 367607 counting only the distinct ones).

The product of its digits is 6480, while the sum is 33.

The square root of 511661616 is about 22619.9384614548. The cubic root of 511661616 is about 799.8237194927.

The spelling of 511661616 in words is "five hundred eleven million, six hundred sixty-one thousand, six hundred sixteen".