665121226361552 has 40 divisors (see below), whose sum is σ = 1313581273021920. Its totient is φ = 326190161888640.

The previous prime is 665121226361549. The next prime is 665121226361611. The reversal of 665121226361552 is 255163622121566.

It is a junction number, because it is equal to n+sod(n) for n = 665121226361494 and 665121226361503.

It is a congruent number.

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, 1801413599 + ... + 1801782782.

It is an arithmetic number, because the mean of its divisors is an integer number (32839531825548).

Almost surely, 2^{665121226361552} is an apocalyptic number.

It is an amenable number.

665121226361552 is a deficient number, since it is larger than the sum of its proper divisors (648460046660368).

665121226361552 is a wasteful number, since it uses less digits than its factorization.

665121226361552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3603196611 (or 3603196605 counting only the distinct ones).

The product of its digits is 7776000, while the sum is 53.

The spelling of 665121226361552 in words is "six hundred sixty-five trillion, one hundred twenty-one billion, two hundred twenty-six million, three hundred sixty-one thousand, five hundred fifty-two".