351143221661 has 16 divisors (see below), whose sum is σ = 367014615408. Its totient is φ = 335689728000.

The previous prime is 351143221657. The next prime is 351143221679. The reversal of 351143221661 is 166122341153.

It can be written as a sum of positive squares in 8 ways, for example, as 6581265625 + 344561956036 = 81125^2 + 586994^2 .

It is a cyclic number.

It is not a de Polignac number, because 351143221661 - 2² = 351143221657 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 (351143221601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35420 + ... + 838773.

It is an arithmetic number, because the mean of its divisors is an integer number (22938413463).

Almost surely, 2^351143221661 is an apocalyptic number.

It is an amenable number.

351143221661 is a deficient number, since it is larger than the sum of its proper divisors (15871393747).

351143221661 is a wasteful number, since it uses less digits than its factorization.

351143221661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 874432.

The product of its digits is 25920, while the sum is 35.

The spelling of 351143221661 in words is "three hundred fifty-one billion, one hundred forty-three million, two hundred twenty-one thousand, six hundred sixty-one".