511811681136 has 80 divisors (see below), whose sum is σ = 1511438095104. Its totient is φ = 146195615232.

The previous prime is 511811681107. The next prime is 511811681137. The reversal of 511811681136 is 631186118115.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (511811681137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1181535 + ... + 1555521.

Almost surely, 2^511811681136 is an apocalyptic number.

511811681136 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

511811681136 is an abundant number, since it is smaller than the sum of its proper divisors (999626413968).

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

511811681136 is a wasteful number, since it uses less digits than its factorization.

511811681136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378078 (or 378072 counting only the distinct ones).

The product of its digits is 34560, while the sum is 42.

The spelling of 511811681136 in words is "five hundred eleven billion, eight hundred eleven million, six hundred eighty-one thousand, one hundred thirty-six".