661354550334 has 48 divisors (see below), whose sum is σ = 1438490327040. Its totient is φ = 219598423440.

The previous prime is 661354550333. The next prime is 661354550371. The reversal of 661354550334 is 433055453166.

661354550334 is a `hidden beast` number, since 6 + 6 + 13 + 54 + 550 + 3 + 34 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 661354550334.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661354550333) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4953547 + ... + 5085305.

It is an arithmetic number, because the mean of its divisors is an integer number (29968548480).

Almost surely, 2^661354550334 is an apocalyptic number.

661354550334 is an abundant number, since it is smaller than the sum of its proper divisors (777135776706).

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

661354550334 is a wasteful number, since it uses less digits than its factorization.

661354550334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132845 (or 132842 counting only the distinct ones).

The product of its (nonzero) digits is 1944000, while the sum is 45.

The spelling of 661354550334 in words is "six hundred sixty-one billion, three hundred fifty-four million, five hundred fifty thousand, three hundred thirty-four".