661560060 has 48 divisors (see below), whose sum is σ = 2116993536. Its totient is φ = 151213632.

The previous prime is 661560047. The next prime is 661560071. The reversal of 661560060 is 60065166.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 787152 + ... + 787991.

It is an arithmetic number, because the mean of its divisors is an integer number (44104032).

Almost surely, 2^661560060 is an apocalyptic number.

661560060 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

661560060 is an abundant number, since it is smaller than the sum of its proper divisors (1455433476).

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

661560060 is a wasteful number, since it uses less digits than its factorization.

661560060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1575162 (or 1575160 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 661560060 is about 25720.8098628329. The cubic root of 661560060 is about 871.3442292797.

The spelling of 661560060 in words is "six hundred sixty-one million, five hundred sixty thousand, sixty".