1553618505949 has 2 divisors, whose sum is σ = 1553618505950. Its totient is φ = 1553618505948.

The previous prime is 1553618505937. The next prime is 1553618505983. The reversal of 1553618505949 is 9495058163551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1363247726724 + 190370779225 = 1167582^2 + 436315^2 .

It is an emirp because it is prime and its reverse (9495058163551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1553618505949 - 2¹⁷ = 1553618374877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1553618505749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 776809252974 + 776809252975.

It is an arithmetic number, because the mean of its divisors is an integer number (776809252975).

Almost surely, 2^{1553618505949} is an apocalyptic number.

It is an amenable number.

1553618505949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1553618505949 is an equidigital number, since it uses as much as digits as its factorization.

1553618505949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29160000, while the sum is 61.

The spelling of 1553618505949 in words is "one trillion, five hundred fifty-three billion, six hundred eighteen million, five hundred five thousand, nine hundred forty-nine".