661067127552 has 216 divisors, whose sum is σ = 1987993615104. Its totient is φ = 194560684032.

The previous prime is 661067127541. The next prime is 661067127593. The reversal of 661067127552 is 255721760166.

661067127552 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2874493 + ... + 3095939.

It is an arithmetic number, because the mean of its divisors is an integer number (9203674144).

Almost surely, 2^661067127552 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 661067127552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (993996807552).

661067127552 is an abundant number, since it is smaller than the sum of its proper divisors (1326926487552).

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

661067127552 is a wasteful number, since it uses less digits than its factorization.

661067127552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221515 (or 221488 counting only the distinct ones).

The product of its (nonzero) digits is 1058400, while the sum is 48.

The spelling of 661067127552 in words is "six hundred sixty-one billion, sixty-seven million, one hundred twenty-seven thousand, five hundred fifty-two".