661468102478517 has 8 divisors (see below), whose sum is σ = 881959582967296. Its totient is φ = 440977678487712.

The previous prime is 661468102478471. The next prime is 661468102478531. The reversal of 661468102478517 is 715874201864166.

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

It is not a de Polignac number, because 661468102478517 - 2¹¹ = 661468102476469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661468102477517) 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, 262662448 + ... + 265168809.

It is an arithmetic number, because the mean of its divisors is an integer number (110244947870912).

Almost surely, 2^{661468102478517} is an apocalyptic number.

It is an amenable number.

661468102478517 is a deficient number, since it is larger than the sum of its proper divisors (220491480488779).

661468102478517 is a wasteful number, since it uses less digits than its factorization.

661468102478517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528248987.

The product of its (nonzero) digits is 108380160, while the sum is 66.

The spelling of 661468102478517 in words is "six hundred sixty-one trillion, four hundred sixty-eight billion, one hundred two million, four hundred seventy-eight thousand, five hundred seventeen".