661151480 has 64 divisors (see below), whose sum is σ = 1630044000. Its totient is φ = 239349760.

The previous prime is 661151461. The next prime is 661151507. The reversal of 661151480 is 84151166.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99296 + ... + 105744.

Almost surely, 2^661151480 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661151480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (815022000).

661151480 is an abundant number, since it is smaller than the sum of its proper divisors (968892520).

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

661151480 is a wasteful number, since it uses less digits than its factorization.

661151480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6704 (or 6700 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 661151480 is about 25712.8660401753. The cubic root of 661151480 is about 871.1648113838.

The spelling of 661151480 in words is "six hundred sixty-one million, one hundred fifty-one thousand, four hundred eighty".