511457665531 has 2 divisors, whose sum is σ = 511457665532. Its totient is φ = 511457665530.

The previous prime is 511457665529. The next prime is 511457665597. The reversal of 511457665531 is 135566754115.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 511457665531 - 2¹ = 511457665529 is a prime.

It is a super-2 number, since 2×511457665531² (a number of 24 digits) contains 22 as substring.

Together with 511457665529, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (511457663531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255728832765 + 255728832766.

It is an arithmetic number, because the mean of its divisors is an integer number (255728832766).

Almost surely, 2^511457665531 is an apocalyptic number.

511457665531 is a deficient number, since it is larger than the sum of its proper divisors (1).

511457665531 is an equidigital number, since it uses as much as digits as its factorization.

511457665531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1890000, while the sum is 49.

The spelling of 511457665531 in words is "five hundred eleven billion, four hundred fifty-seven million, six hundred sixty-five thousand, five hundred thirty-one".