661465632 has 48 divisors (see below), whose sum is σ = 1738340352. Its totient is φ = 220235520.

The previous prime is 661465621. The next prime is 661465771. The reversal of 661465632 is 236564166.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92257 + ... + 99167.

It is an arithmetic number, because the mean of its divisors is an integer number (36215424).

Almost surely, 2^661465632 is an apocalyptic number.

It is an amenable number.

661465632 is an abundant number, since it is smaller than the sum of its proper divisors (1076874720).

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

661465632 is a wasteful number, since it uses less digits than its factorization.

661465632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7921 (or 7913 counting only the distinct ones).

The product of its digits is 155520, while the sum is 39.

The square root of 661465632 is about 25718.9741630571. The cubic root of 661465632 is about 871.3027701022.

The spelling of 661465632 in words is "six hundred sixty-one million, four hundred sixty-five thousand, six hundred thirty-two".