661424330 has 16 divisors (see below), whose sum is σ = 1360644480. Its totient is φ = 226774032.

The previous prime is 661424327. The next prime is 661424347. The reversal of 661424330 is 33424166.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 661424293 and 661424302.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4724390 + ... + 4724529.

It is an arithmetic number, because the mean of its divisors is an integer number (85040280).

Almost surely, 2^661424330 is an apocalyptic number.

661424330 is an abundant number, since it is smaller than the sum of its proper divisors (699220150).

661424330 is a wasteful number, since it uses less digits than its factorization.

661424330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9448933.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 661424330 is about 25718.1712024786. The cubic root of 661424330 is about 871.2846349720.

Adding to 661424330 its reverse (33424166), we get a palindrome (694848496).

The spelling of 661424330 in words is "six hundred sixty-one million, four hundred twenty-four thousand, three hundred thirty".