661078573410674 has 8 divisors (see below), whose sum is σ = 991931365614000. Its totient is φ = 330434784872676.

The previous prime is 661078573410581. The next prime is 661078573410769. The reversal of 661078573410674 is 476014375870166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 661078573410674.

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, 52250908424 + ... + 52250921075.

It is an arithmetic number, because the mean of its divisors is an integer number (123991420701750).

Almost surely, 2^{661078573410674} is an apocalyptic number.

661078573410674 is a deficient number, since it is larger than the sum of its proper divisors (330852792203326).

661078573410674 is a wasteful number, since it uses less digits than its factorization.

661078573410674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104501832664.

The product of its (nonzero) digits is 142248960, while the sum is 65.

The spelling of 661078573410674 in words is "six hundred sixty-one trillion, seventy-eight billion, five hundred seventy-three million, four hundred ten thousand, six hundred seventy-four".