661633792092 has 288 divisors, whose sum is σ = 2158588548480. Its totient is φ = 166170009600.

The previous prime is 661633792087. The next prime is 661633792103. The reversal of 661633792092 is 290297336166.

661633792092 is a `hidden beast` number, since 6 + 6 + 1 + 63 + 379 + 209 + 2 = 666.

It is a super-3 number, since 3×661633792092³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6887592 + ... + 6982992.

Almost surely, 2^661633792092 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 661633792092, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1079294274240).

661633792092 is an abundant number, since it is smaller than the sum of its proper divisors (1496954756388).

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

661633792092 is a wasteful number, since it uses less digits than its factorization.

661633792092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95533 (or 95528 counting only the distinct ones).

The product of its (nonzero) digits is 4408992, while the sum is 54.

The spelling of 661633792092 in words is "six hundred sixty-one billion, six hundred thirty-three million, seven hundred ninety-two thousand, ninety-two".