661017024 has 140 divisors (see below), whose sum is σ = 2001889824. Its totient is φ = 215571456.

The previous prime is 661017017. The next prime is 661017043. The reversal of 661017024 is 420710166.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 242292 + ... + 245004.

Almost surely, 2^661017024 is an apocalyptic number.

661017024 is a gapful number since it is divisible by the number (64) 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 661017024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1000944912).

661017024 is an abundant number, since it is smaller than the sum of its proper divisors (1340872800).

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

661017024 is a wasteful number, since it uses less digits than its factorization.

661017024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2784 (or 2765 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 661017024 is about 25710.2513406618. The cubic root of 661017024 is about 871.1057521613.

The spelling of 661017024 in words is "six hundred sixty-one million, seventeen thousand, twenty-four".