1555386478480 has 40 divisors (see below), whose sum is σ = 3649450404600. Its totient is φ = 616446747648.

The previous prime is 1555386478409. The next prime is 1555386478487. The reversal of 1555386478480 is 848746835551.

It can be written as a sum of positive squares in 4 ways, for example, as 79948693504 + 1475437784976 = 282752^2 + 1214676^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×1555386478480² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1555386478487) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89176285 + ... + 89193724.

It is an arithmetic number, because the mean of its divisors is an integer number (91236260115).

Almost surely, 2^{1555386478480} is an apocalyptic number.

1555386478480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1555386478480 is an abundant number, since it is smaller than the sum of its proper divisors (2094063926120).

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

1555386478480 is a wasteful number, since it uses less digits than its factorization.

1555386478480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178370131 (or 178370125 counting only the distinct ones).

The product of its (nonzero) digits is 129024000, while the sum is 64.

The spelling of 1555386478480 in words is "one trillion, five hundred fifty-five billion, three hundred eighty-six million, four hundred seventy-eight thousand, four hundred eighty".