661045510432 has 12 divisors (see below), whose sum is σ = 1301433348726. Its totient is φ = 330522755200.

The previous prime is 661045510409. The next prime is 661045510451. The reversal of 661045510432 is 234015540166.

It can be written as a sum of positive squares in only one way, i.e., 631446372496 + 29599137936 = 794636^2 + 172044^2 .

It is a junction number, because it is equal to n+sod(n) for n = 661045510391 and 661045510400.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10328836069 + ... + 10328836132.

Almost surely, 2^661045510432 is an apocalyptic number.

It is an amenable number.

661045510432 is a deficient number, since it is larger than the sum of its proper divisors (640387838294).

661045510432 is a wasteful number, since it uses less digits than its factorization.

661045510432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20657672211 (or 20657672203 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 661045510432 in words is "six hundred sixty-one billion, forty-five million, five hundred ten thousand, four hundred thirty-two".