661464060 has 48 divisors (see below), whose sum is σ = 1861440000. Its totient is φ = 175500864.

The previous prime is 661464007. The next prime is 661464071. The reversal of 661464060 is 60464166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15760 + ... + 39639.

It is an arithmetic number, because the mean of its divisors is an integer number (38780000).

Almost surely, 2^661464060 is an apocalyptic number.

661464060 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

661464060 is an abundant number, since it is smaller than the sum of its proper divisors (1199975940).

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

661464060 is a wasteful number, since it uses less digits than its factorization.

661464060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55610 (or 55608 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 661464060 is about 25718.9436019445. The cubic root of 661464060 is about 871.3020798728.

The spelling of 661464060 in words is "six hundred sixty-one million, four hundred sixty-four thousand, sixty".