661825661042 has 32 divisors (see below), whose sum is σ = 1222240139904. Its totient is φ = 261733680000.

The previous prime is 661825660981. The next prime is 661825661099. The reversal of 661825661042 is 240166528166.

It is a super-3 number, since 3×661825661042³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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, 59684 + ... + 1152047.

It is an arithmetic number, because the mean of its divisors is an integer number (38195004372).

Almost surely, 2^661825661042 is an apocalyptic number.

661825661042 is a deficient number, since it is larger than the sum of its proper divisors (560414478862).

661825661042 is a wasteful number, since it uses less digits than its factorization.

661825661042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1214754.

The product of its (nonzero) digits is 829440, while the sum is 47.

The spelling of 661825661042 in words is "six hundred sixty-one billion, eight hundred twenty-five million, six hundred sixty-one thousand, forty-two".