123665057516 has 576 divisors, whose sum is σ = 328381724160. Its totient is φ = 39886479360.

The previous prime is 123665057473. The next prime is 123665057543. The reversal of 123665057516 is 615750566321.

It is a super-3 number, since 3×123665057516³ (a number of 34 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 1489940411 + ... + 1489940493.

It is an arithmetic number, because the mean of its divisors is an integer number (570107160).

Almost surely, 2^123665057516 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123665057516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164190862080).

123665057516 is an abundant number, since it is smaller than the sum of its proper divisors (204716666644).

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

123665057516 is a wasteful number, since it uses less digits than its factorization.

123665057516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254 (or 245 counting only the distinct ones).

The product of its (nonzero) digits is 1134000, while the sum is 47.

The spelling of 123665057516 in words is "one hundred twenty-three billion, six hundred sixty-five million, fifty-seven thousand, five hundred sixteen".