511155365240 has 144 divisors (see below), whose sum is σ = 1314376162200. Its totient is φ = 178800051456.

The previous prime is 511155365239. The next prime is 511155365261. The reversal of 511155365240 is 42563551115.

It is a super-2 number, since 2×511155365240² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 511155365194 and 511155365203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2335631 + ... + 2545089.

Almost surely, 2^511155365240 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 511155365240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (657188081100).

511155365240 is an abundant number, since it is smaller than the sum of its proper divisors (803220796960).

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

511155365240 is a wasteful number, since it uses less digits than its factorization.

511155365240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209534 (or 209498 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 38.

The spelling of 511155365240 in words is "five hundred eleven billion, one hundred fifty-five million, three hundred sixty-five thousand, two hundred forty".