1754401401661 has 2 divisors, whose sum is σ = 1754401401662. Its totient is φ = 1754401401660.

The previous prime is 1754401401601. The next prime is 1754401401689. The reversal of 1754401401661 is 1661041044571.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1722147037636 + 32254364025 = 1312306^2 + 179595^2 .

It is a cyclic number.

It is not a de Polignac number, because 1754401401661 - 2¹⁵ = 1754401368893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1754401401601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 877200700830 + 877200700831.

It is an arithmetic number, because the mean of its divisors is an integer number (877200700831).

Almost surely, 2^{1754401401661} is an apocalyptic number.

It is an amenable number.

1754401401661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1754401401661 is an equidigital number, since it uses as much as digits as its factorization.

1754401401661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 1754401401661 in words is "one trillion, seven hundred fifty-four billion, four hundred one million, four hundred one thousand, six hundred sixty-one".