661620350 has 24 divisors (see below), whose sum is σ = 1233750648. Its totient is φ = 263973600.

The previous prime is 661620319. The next prime is 661620367. The reversal of 661620350 is 53026166.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3185 + ... + 36515.

It is an arithmetic number, because the mean of its divisors is an integer number (51406277).

Almost surely, 2^661620350 is an apocalyptic number.

661620350 is a deficient number, since it is larger than the sum of its proper divisors (572130298).

661620350 is a wasteful number, since it uses less digits than its factorization.

661620350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33740 (or 33735 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 661620350 is about 25721.9818443292. The cubic root of 661620350 is about 871.3706979009.

The spelling of 661620350 in words is "six hundred sixty-one million, six hundred twenty thousand, three hundred fifty".