661072332129 has 64 divisors (see below), whose sum is σ = 978506791680. Its totient is φ = 393660933120.

The previous prime is 661072332113. The next prime is 661072332161. The reversal of 661072332129 is 921233270166.

It is not a de Polignac number, because 661072332129 - 2⁴ = 661072332113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661072336129) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 413945559 + ... + 413947155.

It is an arithmetic number, because the mean of its divisors is an integer number (15289168620).

Almost surely, 2^661072332129 is an apocalyptic number.

It is an amenable number.

661072332129 is a deficient number, since it is larger than the sum of its proper divisors (317434459551).

661072332129 is a wasteful number, since it uses less digits than its factorization.

661072332129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2610.

The product of its (nonzero) digits is 163296, while the sum is 42.

The spelling of 661072332129 in words is "six hundred sixty-one billion, seventy-two million, three hundred thirty-two thousand, one hundred twenty-nine".