511551555656 has 16 divisors (see below), whose sum is σ = 964902637440. Its totient is φ = 254244185680.

The previous prime is 511551555649. The next prime is 511551555659. The reversal of 511551555656 is 656555155115.

It is not an unprimeable number, because it can be changed into a prime (511551555659) 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, 191447600 + ... + 191450271.

It is an arithmetic number, because the mean of its divisors is an integer number (60306414840).

Almost surely, 2^511551555656 is an apocalyptic number.

It is an amenable number.

511551555656 is a deficient number, since it is larger than the sum of its proper divisors (453351081784).

511551555656 is a wasteful number, since it uses less digits than its factorization.

511551555656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382898044 (or 382898040 counting only the distinct ones).

The product of its digits is 2812500, while the sum is 50.

The spelling of 511551555656 in words is "five hundred eleven billion, five hundred fifty-one million, five hundred fifty-five thousand, six hundred fifty-six".