661306434323530 has 32 divisors (see below), whose sum is σ = 1194886355249664. Its totient is φ = 263514860977536.

The previous prime is 661306434323477. The next prime is 661306434323551. The reversal of 661306434323530 is 35323434603166.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 391324047 + ... + 393010333.

It is an arithmetic number, because the mean of its divisors is an integer number (37340198601552).

Almost surely, 2^{661306434323530} is an apocalyptic number.

661306434323530 is a deficient number, since it is larger than the sum of its proper divisors (533579920926134).

661306434323530 is a wasteful number, since it uses less digits than its factorization.

661306434323530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1835670.

The product of its (nonzero) digits is 8398080, while the sum is 49.

Adding to 661306434323530 its reverse (35323434603166), we get a palindrome (696629868926696).

The spelling of 661306434323530 in words is "six hundred sixty-one trillion, three hundred six billion, four hundred thirty-four million, three hundred twenty-three thousand, five hundred thirty".