661452480 has 420 divisors, whose sum is σ = 2564690832. Its totient is φ = 161740800.

The previous prime is 661452443. The next prime is 661452499. The reversal of 661452480 is 84254166.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 4380405 + ... + 4380555.

Almost surely, 2^661452480 is an apocalyptic number.

661452480 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661452480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1282345416).

661452480 is an abundant number, since it is smaller than the sum of its proper divisors (1903238352).

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

661452480 is a wasteful number, since it uses less digits than its factorization.

661452480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206 (or 174 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 661452480 is about 25718.7184750718. The cubic root of 661452480 is about 871.2969953249.

The spelling of 661452480 in words is "six hundred sixty-one million, four hundred fifty-two thousand, four hundred eighty".