661525341644 has 12 divisors (see below), whose sum is σ = 1157689314600. Its totient is φ = 330756966048.

The previous prime is 661525341629. The next prime is 661525341649. The reversal of 661525341644 is 446143525166.

It is not an unprimeable number, because it can be changed into a prime (661525341649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1159754 + ... + 1633425.

It is an arithmetic number, because the mean of its divisors is an integer number (96474109550).

Almost surely, 2^661525341644 is an apocalyptic number.

It is an amenable number.

661525341644 is a deficient number, since it is larger than the sum of its proper divisors (496163972956).

661525341644 is a wasteful number, since it uses less digits than its factorization.

661525341644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2852392 (or 2852390 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 47.

The spelling of 661525341644 in words is "six hundred sixty-one billion, five hundred twenty-five million, three hundred forty-one thousand, six hundred forty-four".