511621440664 has 64 divisors (see below), whose sum is σ = 980651499840. Its totient is φ = 250179256320.

The previous prime is 511621440661. The next prime is 511621440667. The reversal of 511621440664 is 466044126115.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (511621440661) and next prime (511621440667).

It is a super-3 number, since 3×511621440664³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (511621440661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44900952 + ... + 44912344.

It is an arithmetic number, because the mean of its divisors is an integer number (15322679685).

Almost surely, 2^511621440664 is an apocalyptic number.

It is an amenable number.

511621440664 is a deficient number, since it is larger than the sum of its proper divisors (469030059176).

511621440664 is a wasteful number, since it uses less digits than its factorization.

511621440664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12100 (or 12096 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 40.

Adding to 511621440664 its reverse (466044126115), we get a palindrome (977665566779).

The spelling of 511621440664 in words is "five hundred eleven billion, six hundred twenty-one million, four hundred forty thousand, six hundred sixty-four".