661421300146680 has 32 divisors (see below), whose sum is σ = 1984263900440400. Its totient is φ = 176379013372416.

The previous prime is 661421300146661. The next prime is 661421300146703. The reversal of 661421300146680 is 86641003124166.

It is a congruent number.

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, 2755922083825 + ... + 2755922084064.

Almost surely, 2^{661421300146680} is an apocalyptic number.

661421300146680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

661421300146680 is an abundant number, since it is smaller than the sum of its proper divisors (1322842600293720).

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

661421300146680 is a wasteful number, since it uses less digits than its factorization.

661421300146680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5511844167903 (or 5511844167899 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 48.

The spelling of 661421300146680 in words is "six hundred sixty-one trillion, four hundred twenty-one billion, three hundred million, one hundred forty-six thousand, six hundred eighty".