511172056011 has 4 divisors (see below), whose sum is σ = 681562741352. Its totient is φ = 340781370672.

The previous prime is 511172055959. The next prime is 511172056049. The reversal of 511172056011 is 110650271115.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 511172056011 - 2¹¹ = 511172053963 is a prime.

It is a super-2 number, since 2×511172056011² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 511172056011.

It is not an unprimeable number, because it can be changed into a prime (511172056081) 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, 85195342666 + ... + 85195342671.

It is an arithmetic number, because the mean of its divisors is an integer number (170390685338).

Almost surely, 2^511172056011 is an apocalyptic number.

511172056011 is a deficient number, since it is larger than the sum of its proper divisors (170390685341).

511172056011 is a wasteful number, since it uses less digits than its factorization.

511172056011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170390685340.

The product of its (nonzero) digits is 2100, while the sum is 30.

The spelling of 511172056011 in words is "five hundred eleven billion, one hundred seventy-two million, fifty-six thousand, eleven".