354405676621 has 2 divisors, whose sum is σ = 354405676622. Its totient is φ = 354405676620.

The previous prime is 354405676619. The next prime is 354405676657. The reversal of 354405676621 is 126676504453.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 340605300996 + 13800375625 = 583614^2 + 117475^2 .

It is an emirp because it is prime and its reverse (126676504453) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 354405676621 - 2¹ = 354405676619 is a prime.

Together with 354405676619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (354405676601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 177202838310 + 177202838311.

It is an arithmetic number, because the mean of its divisors is an integer number (177202838311).

Almost surely, 2^354405676621 is an apocalyptic number.

It is an amenable number.

354405676621 is a deficient number, since it is larger than the sum of its proper divisors (1).

354405676621 is an equidigital number, since it uses as much as digits as its factorization.

354405676621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3628800, while the sum is 49.

The spelling of 354405676621 in words is "three hundred fifty-four billion, four hundred five million, six hundred seventy-six thousand, six hundred twenty-one".