661246430 has 64 divisors (see below), whose sum is σ = 1342365696. Its totient is φ = 232848000.

The previous prime is 661246409. The next prime is 661246441. The reversal of 661246430 is 34642166.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 284975 + ... + 287285.

It is an arithmetic number, because the mean of its divisors is an integer number (20974464).

Almost surely, 2^661246430 is an apocalyptic number.

661246430 is an abundant number, since it is smaller than the sum of its proper divisors (681119266).

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

661246430 is a wasteful number, since it uses less digits than its factorization.

661246430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2433.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 661246430 is about 25714.7123258262. The cubic root of 661246430 is about 871.2065129414.

Adding to 661246430 its reverse (34642166), we get a palindrome (695888596).

The spelling of 661246430 in words is "six hundred sixty-one million, two hundred forty-six thousand, four hundred thirty".