664520145145552 has 10 divisors (see below), whose sum is σ = 1287507781219538. Its totient is φ = 332260072572768.

The previous prime is 664520145145541. The next prime is 664520145145553. The reversal of 664520145145552 is 255541541025466.

It can be written as a sum of positive squares in only one way, i.e., 629209263393936 + 35310881751616 = 25084044^2 + 5942296^2 .

It is a super-2 number, since 2×664520145145552² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 664520145145493 and 664520145145502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664520145145553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20766254535783 + ... + 20766254535814.

Almost surely, 2^{664520145145552} is an apocalyptic number.

It is an amenable number.

664520145145552 is a deficient number, since it is larger than the sum of its proper divisors (622987636073986).

664520145145552 is a wasteful number, since it uses less digits than its factorization.

664520145145552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41532509071605 (or 41532509071599 counting only the distinct ones).

The product of its (nonzero) digits is 28800000, while the sum is 55.

It can be divided in two parts, 6645201 and 45145552, that added together give a triangular number (51790753 = T₁₀₁₇₇).

The spelling of 664520145145552 in words is "six hundred sixty-four trillion, five hundred twenty billion, one hundred forty-five million, one hundred forty-five thousand, five hundred fifty-two".