1555402020493 has 2 divisors, whose sum is σ = 1555402020494. Its totient is φ = 1555402020492.

The previous prime is 1555402020437. The next prime is 1555402020547. The reversal of 1555402020493 is 3940202045551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1045510340004 + 509891680489 = 1022502^2 + 714067^2 .

It is a cyclic number.

It is not a de Polignac number, because 1555402020493 - 2¹³ = 1555402012301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1555492020493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777701010246 + 777701010247.

It is an arithmetic number, because the mean of its divisors is an integer number (777701010247).

Almost surely, 2^{1555402020493} is an apocalyptic number.

It is an amenable number.

1555402020493 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555402020493 is an equidigital number, since it uses as much as digits as its factorization.

1555402020493 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 1555402020493 in words is "one trillion, five hundred fifty-five billion, four hundred two million, twenty thousand, four hundred ninety-three".