351604661721 has 8 divisors (see below), whose sum is σ = 468844376064. Its totient is φ = 234384027600.

The previous prime is 351604661717. The next prime is 351604661729. The reversal of 351604661721 is 127166406153.

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

It is not a de Polignac number, because 351604661721 - 2² = 351604661717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (351604661729) 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, 4727001 + ... + 4800806.

It is an arithmetic number, because the mean of its divisors is an integer number (58605547008).

Almost surely, 2^351604661721 is an apocalyptic number.

It is an amenable number.

351604661721 is a deficient number, since it is larger than the sum of its proper divisors (117239714343).

351604661721 is a wasteful number, since it uses less digits than its factorization.

351604661721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9540111.

The product of its (nonzero) digits is 181440, while the sum is 42.

The spelling of 351604661721 in words is "three hundred fifty-one billion, six hundred four million, six hundred sixty-one thousand, seven hundred twenty-one".