660401952 has 48 divisors (see below), whose sum is σ = 1981207872. Its totient is φ = 188686080.

The previous prime is 660401947. The next prime is 660401953. The reversal of 660401952 is 259104066.

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

It is a super-2 number, since 2×660401952² = 872261476410820608, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (660401953) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 490699 + ... + 492042.

It is an arithmetic number, because the mean of its divisors is an integer number (41275164).

Almost surely, 2^660401952 is an apocalyptic number.

It is an amenable number.

660401952 is an abundant number, since it is smaller than the sum of its proper divisors (1320805920).

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

660401952 is a wasteful number, since it uses less digits than its factorization.

660401952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 982761 (or 982753 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 660401952 is about 25698.2869467986. The cubic root of 660401952 is about 870.8354822552.

The spelling of 660401952 in words is "six hundred sixty million, four hundred one thousand, nine hundred fifty-two".