661430601 has 48 divisors (see below), whose sum is σ = 1087037952. Its totient is φ = 384652800.

The previous prime is 661430599. The next prime is 661430617. The reversal of 661430601 is 106034166.

It is not a de Polignac number, because 661430601 - 2¹ = 661430599 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661430621) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 153841 + ... + 158081.

It is an arithmetic number, because the mean of its divisors is an integer number (22646624).

Almost surely, 2^661430601 is an apocalyptic number.

It is an amenable number.

661430601 is a deficient number, since it is larger than the sum of its proper divisors (425607351).

661430601 is a wasteful number, since it uses less digits than its factorization.

661430601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4334 (or 4331 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 661430601 is about 25718.2931198787. The cubic root of 661430601 is about 871.2873885289.

Adding to 661430601 its reverse (106034166), we get a palindrome (767464767).

The spelling of 661430601 in words is "six hundred sixty-one million, four hundred thirty thousand, six hundred one".