661322156084 has 12 divisors (see below), whose sum is σ = 1181937470784. Its totient is φ = 323625735864.

The previous prime is 661322156063. The next prime is 661322156123. The reversal of 661322156084 is 480651223166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1758835334 + ... + 1758835709.

It is an arithmetic number, because the mean of its divisors is an integer number (98494789232).

Almost surely, 2^661322156084 is an apocalyptic number.

It is an amenable number.

661322156084 is a deficient number, since it is larger than the sum of its proper divisors (520615314700).

661322156084 is a wasteful number, since it uses less digits than its factorization.

661322156084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3517671094 (or 3517671092 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 44.

The spelling of 661322156084 in words is "six hundred sixty-one billion, three hundred twenty-two million, one hundred fifty-six thousand, eighty-four".