1661506610053 has 2 divisors, whose sum is σ = 1661506610054. Its totient is φ = 1661506610052.

The previous prime is 1661506610011. The next prime is 1661506610069. The reversal of 1661506610053 is 3500166051661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1485943934049 + 175562676004 = 1218993^2 + 419002^2 .

It is a cyclic number.

It is not a de Polignac number, because 1661506610053 - 2⁹ = 1661506609541 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1661506609988 and 1661506610015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1661506610083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830753305026 + 830753305027.

It is an arithmetic number, because the mean of its divisors is an integer number (830753305027).

Almost surely, 2^{1661506610053} is an apocalyptic number.

It is an amenable number.

1661506610053 is a deficient number, since it is larger than the sum of its proper divisors (1).

1661506610053 is an equidigital number, since it uses as much as digits as its factorization.

1661506610053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97200, while the sum is 40.

The spelling of 1661506610053 in words is "one trillion, six hundred sixty-one billion, five hundred six million, six hundred ten thousand, fifty-three".