1555385553940 has 12 divisors (see below), whose sum is σ = 3266309663316. Its totient is φ = 622154221568.

The previous prime is 1555385553901. The next prime is 1555385553949. The reversal of 1555385553940 is 493555835551.

It can be written as a sum of positive squares in 2 ways, for example, as 618481582096 + 936903971844 = 786436^2 + 967938^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555385553949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38884638829 + ... + 38884638868.

It is an arithmetic number, because the mean of its divisors is an integer number (272192471943).

Almost surely, 2^{1555385553940} is an apocalyptic number.

1555385553940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1555385553940 is an abundant number, since it is smaller than the sum of its proper divisors (1710924109376).

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

1555385553940 is a wasteful number, since it uses less digits than its factorization.

1555385553940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77769277706 (or 77769277704 counting only the distinct ones).

The product of its (nonzero) digits is 40500000, while the sum is 58.

The spelling of 1555385553940 in words is "one trillion, five hundred fifty-five billion, three hundred eighty-five million, five hundred fifty-three thousand, nine hundred forty".