661570452480 has 352 divisors, whose sum is σ = 2474532555264. Its totient is φ = 147698417664.

The previous prime is 661570452397. The next prime is 661570452497. The reversal of 661570452480 is 84254075166.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4551814 + ... + 4694906.

It is an arithmetic number, because the mean of its divisors is an integer number (7029922032).

Almost surely, 2^661570452480 is an apocalyptic number.

661570452480 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 661570452480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1237266277632).

661570452480 is an abundant number, since it is smaller than the sum of its proper divisors (1812962102784).

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

661570452480 is a wasteful number, since it uses less digits than its factorization.

661570452480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143171 (or 143153 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 48.

The spelling of 661570452480 in words is "six hundred sixty-one billion, five hundred seventy million, four hundred fifty-two thousand, four hundred eighty".