5455431661 has 2 divisors, whose sum is σ = 5455431662. Its totient is φ = 5455431660.

The previous prime is 5455431659. The next prime is 5455431673. The reversal of 5455431661 is 1661345545.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3927403561 + 1528028100 = 62669^2 + 39090^2 .

It is a cyclic number.

It is not a de Polignac number, because 5455431661 - 2¹ = 5455431659 is a prime.

Together with 5455431659, 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 (5455401661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2727715830 + 2727715831.

It is an arithmetic number, because the mean of its divisors is an integer number (2727715831).

Almost surely, 2^5455431661 is an apocalyptic number.

It is an amenable number.

5455431661 is a deficient number, since it is larger than the sum of its proper divisors (1).

5455431661 is an equidigital number, since it uses as much as digits as its factorization.

5455431661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216000, while the sum is 40.

The square root of 5455431661 is about 73860.8939899863. The cubic root of 5455431661 is about 1760.3932984901.

The spelling of 5455431661 in words is "five billion, four hundred fifty-five million, four hundred thirty-one thousand, six hundred sixty-one".