351664021661 has 8 divisors (see below), whose sum is σ = 371832625920. Its totient is φ = 331661414592.

The previous prime is 351664021651. The next prime is 351664021693. The reversal of 351664021661 is 166120466153.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-351664021661 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 (351664021651) 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, 41494940 + ... + 41503413.

It is an arithmetic number, because the mean of its divisors is an integer number (46479078240).

Almost surely, 2^351664021661 is an apocalyptic number.

It is an amenable number.

351664021661 is a deficient number, since it is larger than the sum of its proper divisors (20168604259).

351664021661 is a wasteful number, since it uses less digits than its factorization.

351664021661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82998595.

The product of its (nonzero) digits is 155520, while the sum is 41.

The spelling of 351664021661 in words is "three hundred fifty-one billion, six hundred sixty-four million, twenty-one thousand, six hundred sixty-one".