661874242177 has 8 divisors (see below), whose sum is σ = 668270428352. Its totient is φ = 655504542000.

The previous prime is 661874242121. The next prime is 661874242181. The reversal of 661874242177 is 771242478166.

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

It is a cyclic number.

It is not a de Polignac number, because 661874242177 - 2¹¹ = 661874240129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661874242187) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6571278 + ... + 6671239.

It is an arithmetic number, because the mean of its divisors is an integer number (83533803544).

Almost surely, 2^661874242177 is an apocalyptic number.

It is an amenable number.

661874242177 is a deficient number, since it is larger than the sum of its proper divisors (6396186175).

661874242177 is a wasteful number, since it uses less digits than its factorization.

661874242177 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13242999.

The product of its digits is 6322176, while the sum is 55.

The spelling of 661874242177 in words is "six hundred sixty-one billion, eight hundred seventy-four million, two hundred forty-two thousand, one hundred seventy-seven".