354665646621 has 48 divisors (see below), whose sum is σ = 601942915392. Its totient is φ = 198385977600.

The previous prime is 354665646617. The next prime is 354665646623. The reversal of 354665646621 is 126646566453.

354665646621 is a `hidden beast` number, since 3 + 5 + 4 + 6 + 6 + 5 + 6 + 4 + 6 + 621 = 666.

It is not a de Polignac number, because 354665646621 - 2² = 354665646617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (354665646623) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11684961 + ... + 11715273.

It is an arithmetic number, because the mean of its divisors is an integer number (12540477404).

Almost surely, 2^354665646621 is an apocalyptic number.

It is an amenable number.

354665646621 is a deficient number, since it is larger than the sum of its proper divisors (247277268771).

354665646621 is a wasteful number, since it uses less digits than its factorization.

354665646621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39434 (or 39431 counting only the distinct ones).

The product of its digits is 18662400, while the sum is 54.

The spelling of 354665646621 in words is "three hundred fifty-four billion, six hundred sixty-five million, six hundred forty-six thousand, six hundred twenty-one".