1101204101555 has 32 divisors (see below), whose sum is σ = 1379850695808. Its totient is φ = 842831308800.

The previous prime is 1101204101551. The next prime is 1101204101563. The reversal of 1101204101555 is 5551014021011.

It is a happy number.

It is not a de Polignac number, because 1101204101555 - 2² = 1101204101551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1101204101551) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39607739 + ... + 39635531.

It is an arithmetic number, because the mean of its divisors is an integer number (43120334244).

Almost surely, 2^{1101204101555} is an apocalyptic number.

1101204101555 is a deficient number, since it is larger than the sum of its proper divisors (278646594253).

1101204101555 is a wasteful number, since it uses less digits than its factorization.

1101204101555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31407.

The product of its (nonzero) digits is 1000, while the sum is 26.

Adding to 1101204101555 its reverse (5551014021011), we get a palindrome (6652218122566).

The spelling of 1101204101555 in words is "one trillion, one hundred one billion, two hundred four million, one hundred one thousand, five hundred fifty-five".