667568738550 has 96 divisors (see below), whose sum is σ = 1914876940032. Its totient is φ = 150748721280.

The previous prime is 667568738513. The next prime is 667568738653. The reversal of 667568738550 is 55837865766.

It is a super-2 number, since 2×667568738550² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3742849 + ... + 3917148.

It is an arithmetic number, because the mean of its divisors is an integer number (19946634792).

Almost surely, 2^667568738550 is an apocalyptic number.

667568738550 is an abundant number, since it is smaller than the sum of its proper divisors (1247308201482).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

667568738550 is a wasteful number, since it uses less digits than its factorization.

667568738550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7660102 (or 7660097 counting only the distinct ones).

The product of its (nonzero) digits is 254016000, while the sum is 66.

It can be divided in two parts, 66756 and 8738550, that added together give a triangular number (8805306 = T₄₁₉₆).

The spelling of 667568738550 in words is "six hundred sixty-seven billion, five hundred sixty-eight million, seven hundred thirty-eight thousand, five hundred fifty".