661641950 has 24 divisors (see below), whose sum is σ = 1238927400. Its totient is φ = 262877600.

The previous prime is 661641941. The next prime is 661641961. The reversal of 661641950 is 59146166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36956 + ... + 51855.

It is an arithmetic number, because the mean of its divisors is an integer number (51621975).

Almost surely, 2^661641950 is an apocalyptic number.

661641950 is a deficient number, since it is larger than the sum of its proper divisors (577285450).

661641950 is a wasteful number, since it uses less digits than its factorization.

661641950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88972 (or 88967 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 661641950 is about 25722.4017152365. The cubic root of 661641950 is about 871.3801803794.

The spelling of 661641950 in words is "six hundred sixty-one million, six hundred forty-one thousand, nine hundred fifty".