351642121561 has 8 divisors (see below), whose sum is σ = 356257044864. Its totient is φ = 347036204880.

The previous prime is 351642121559. The next prime is 351642121609. The reversal of 351642121561 is 165121246153.

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 351642121561 - 2¹ = 351642121559 is a prime.

It is a super-2 number, since 2×351642121561² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 351642121561.

It is not an unprimeable number, because it can be changed into a prime (351642121531) 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, 2173041 + ... + 2329246.

It is an arithmetic number, because the mean of its divisors is an integer number (44532130608).

Almost surely, 2^351642121561 is an apocalyptic number.

It is an amenable number.

351642121561 is a deficient number, since it is larger than the sum of its proper divisors (4614923303).

351642121561 is an equidigital number, since it uses as much as digits as its factorization.

351642121561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4503311.

The product of its digits is 43200, while the sum is 37.

The spelling of 351642121561 in words is "three hundred fifty-one billion, six hundred forty-two million, one hundred twenty-one thousand, five hundred sixty-one".