2153630661509 has 2 divisors, whose sum is σ = 2153630661510. Its totient is φ = 2153630661508.

The previous prime is 2153630661437. The next prime is 2153630661607. The reversal of 2153630661509 is 9051660363512.

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., 2004781305409 + 148849356100 = 1415903^2 + 385810^2 .

It is a cyclic number.

It is not a de Polignac number, because 2153630661509 - 2¹² = 2153630657413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2153630601509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1076815330754 + 1076815330755.

It is an arithmetic number, because the mean of its divisors is an integer number (1076815330755).

Almost surely, 2^{2153630661509} is an apocalyptic number.

It is an amenable number.

2153630661509 is a deficient number, since it is larger than the sum of its proper divisors (1).

2153630661509 is an equidigital number, since it uses as much as digits as its factorization.

2153630661509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 874800, while the sum is 47.

The spelling of 2153630661509 in words is "two trillion, one hundred fifty-three billion, six hundred thirty million, six hundred sixty-one thousand, five hundred nine".