511155145215 has 128 divisors (see below), whose sum is σ = 1073126799360. Its totient is φ = 227581747200.

The previous prime is 511155145213. The next prime is 511155145219. The reversal of 511155145215 is 512541551115.

511155145215 is a `hidden beast` number, since 5 + 1 + 115 + 5 + 14 + 521 + 5 = 666.

It is not a de Polignac number, because 511155145215 - 2¹ = 511155145213 is a prime.

It is a super-2 number, since 2×511155145215² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 511155145215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (511155145213) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 3657270 + ... + 3794460.

It is an arithmetic number, because the mean of its divisors is an integer number (8383803120).

Almost surely, 2^511155145215 is an apocalyptic number.

511155145215 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

511155145215 is an abundant number, since it is smaller than the sum of its proper divisors (561971654145).

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

511155145215 is a wasteful number, since it uses less digits than its factorization.

511155145215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137422 (or 137416 counting only the distinct ones).

The product of its digits is 25000, while the sum is 36.

The spelling of 511155145215 in words is "five hundred eleven billion, one hundred fifty-five million, one hundred forty-five thousand, two hundred fifteen".