3501754666621 has 2 divisors, whose sum is σ = 3501754666622. Its totient is φ = 3501754666620.

The previous prime is 3501754666609. The next prime is 3501754666643. The reversal of 3501754666621 is 1266664571053.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3169062194596 + 332692472025 = 1780186^2 + 576795^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3501754666621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3501754666661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1750877333310 + 1750877333311.

It is an arithmetic number, because the mean of its divisors is an integer number (1750877333311).

Almost surely, 2^{3501754666621} is an apocalyptic number.

It is an amenable number.

3501754666621 is a deficient number, since it is larger than the sum of its proper divisors (1).

3501754666621 is an equidigital number, since it uses as much as digits as its factorization.

3501754666621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5443200, while the sum is 52.

The spelling of 3501754666621 in words is "three trillion, five hundred one billion, seven hundred fifty-four million, six hundred sixty-six thousand, six hundred twenty-one".