531665056618 has 16 divisors (see below), whose sum is σ = 805698998280. Its totient is φ = 263112708096.

The previous prime is 531665056589. The next prime is 531665056627. The reversal of 531665056618 is 816650566135.

It can be written as a sum of positive squares in 4 ways, for example, as 526113763569 + 5551293049 = 725337^2 + 74507^2 .

It is a super-2 number, since 2×531665056618² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3419823 + ... + 3571906.

Almost surely, 2^531665056618 is an apocalyptic number.

531665056618 is a deficient number, since it is larger than the sum of its proper divisors (274033941662).

531665056618 is a wasteful number, since it uses less digits than its factorization.

531665056618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6992121.

The product of its (nonzero) digits is 3888000, while the sum is 52.

The spelling of 531665056618 in words is "five hundred thirty-one billion, six hundred sixty-five million, fifty-six thousand, six hundred eighteen".