661930464 has 48 divisors (see below), whose sum is σ = 1871230032. Its totient is φ = 203670528.

The previous prime is 661930463. The next prime is 661930471. The reversal of 661930464 is 464039166.

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

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661930463) by changing a digit.

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, 263949 + ... + 266444.

It is an arithmetic number, because the mean of its divisors is an integer number (38983959).

Almost surely, 2^661930464 is an apocalyptic number.

It is an amenable number.

661930464 is an abundant number, since it is smaller than the sum of its proper divisors (1209299568).

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

661930464 is a wasteful number, since it uses less digits than its factorization.

661930464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530419 (or 530411 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 39.

The square root of 661930464 is about 25728.0093283565. The cubic root of 661930464 is about 871.5068192902.

The spelling of 661930464 in words is "six hundred sixty-one million, nine hundred thirty thousand, four hundred sixty-four".