661905336 has 64 divisors (see below), whose sum is σ = 1754887680. Its totient is φ = 207326720.

The previous prime is 661905313. The next prime is 661905341. The reversal of 661905336 is 633509166.

It is a junction number, because it is equal to n+sod(n) for n = 661905294 and 661905303.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 444385 + ... + 445871.

It is an arithmetic number, because the mean of its divisors is an integer number (27420120).

Almost surely, 2^661905336 is an apocalyptic number.

It is an amenable number.

661905336 is an abundant number, since it is smaller than the sum of its proper divisors (1092982344).

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

661905336 is a wasteful number, since it uses less digits than its factorization.

661905336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2604 (or 2600 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 39.

The square root of 661905336 is about 25727.5209843467. The cubic root of 661905336 is about 871.4957911930.

The spelling of 661905336 in words is "six hundred sixty-one million, nine hundred five thousand, three hundred thirty-six".