1011555546400 has 144 divisors (see below), whose sum is σ = 2970779232960. Its totient is φ = 328565376000.

The previous prime is 1011555546311. The next prime is 1011555546401. The reversal of 1011555546400 is 46455551101.

It is a self number, because there is not a number n which added to its sum of digits gives 1011555546400.

It is not an unprimeable number, because it can be changed into a prime (1011555546401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4647151 + ... + 4859950.

It is an arithmetic number, because the mean of its divisors is an integer number (20630411340).

Almost surely, 2^{1011555546400} is an apocalyptic number.

1011555546400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1011555546400 is an abundant number, since it is smaller than the sum of its proper divisors (1959223686560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1011555546400 is a wasteful number, since it uses less digits than its factorization.

1011555546400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9507147 (or 9507134 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 37.

The spelling of 1011555546400 in words is "one trillion, eleven billion, five hundred fifty-five million, five hundred forty-six thousand, four hundred".