1811478881340 has 96 divisors (see below), whose sum is σ = 5773168537920. Its totient is φ = 471279052800.

The previous prime is 1811478881327. The next prime is 1811478881363. The reversal of 1811478881340 is 431888741181.

1811478881340 is a `hidden beast` number, since 1 + 8 + 1 + 147 + 88 + 81 + 340 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40887501 + ... + 40931780.

It is an arithmetic number, because the mean of its divisors is an integer number (60137172270).

Almost surely, 2^{1811478881340} is an apocalyptic number.

1811478881340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1811478881340 is an abundant number, since it is smaller than the sum of its proper divisors (3961689656580).

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

1811478881340 is a wasteful number, since it uses less digits than its factorization.

1811478881340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81819340 (or 81819332 counting only the distinct ones).

The product of its (nonzero) digits is 1376256, while the sum is 54.

The spelling of 1811478881340 in words is "one trillion, eight hundred eleven billion, four hundred seventy-eight million, eight hundred eighty-one thousand, three hundred forty".