1668508417501 has 4 divisors (see below), whose sum is σ = 1669621500000. Its totient is φ = 1667395335004.

The previous prime is 1668508417483. The next prime is 1668508417517. The reversal of 1668508417501 is 1057148058661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1668508417501 - 2²³ = 1668500028893 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 (1668508417561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 556539001 + ... + 556541998.

It is an arithmetic number, because the mean of its divisors is an integer number (417405375000).

Almost surely, 2^{1668508417501} is an apocalyptic number.

It is an amenable number.

1668508417501 is a deficient number, since it is larger than the sum of its proper divisors (1113082499).

1668508417501 is a wasteful number, since it uses less digits than its factorization.

1668508417501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1113082498.

The product of its (nonzero) digits is 1612800, while the sum is 52.

The spelling of 1668508417501 in words is "one trillion, six hundred sixty-eight billion, five hundred eight million, four hundred seventeen thousand, five hundred one".