1555402042401 has 16 divisors (see below), whose sum is σ = 2076062387520. Its totient is φ = 1035838379520.

The previous prime is 1555402042387. The next prime is 1555402042417. The reversal of 1555402042401 is 1042402045551.

It is a happy number.

It is not a de Polignac number, because 1555402042401 - 2³¹ = 1553254558753 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1555402042501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67729561 + ... + 67752521.

It is an arithmetic number, because the mean of its divisors is an integer number (129753899220).

Almost surely, 2^{1555402042401} is an apocalyptic number.

It is an amenable number.

1555402042401 is a deficient number, since it is larger than the sum of its proper divisors (520660345119).

1555402042401 is a wasteful number, since it uses less digits than its factorization.

1555402042401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45856.

The product of its (nonzero) digits is 32000, while the sum is 33.

Adding to 1555402042401 its reverse (1042402045551), we get a palindrome (2597804087952).

The spelling of 1555402042401 in words is "one trillion, five hundred fifty-five billion, four hundred two million, forty-two thousand, four hundred one".