1555401457680 has 80 divisors (see below), whose sum is σ = 5510565170304. Its totient is φ = 355520332800.

The previous prime is 1555401457669. The next prime is 1555401457691. The reversal of 1555401457680 is 867541045551.

It is an interprime number because it is at equal distance from previous prime (1555401457669) and next prime (1555401457691).

It is a tau number, because it is divible by the number of its divisors (80).

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 462915421 + ... + 462918780.

Almost surely, 2^{1555401457680} is an apocalyptic number.

1555401457680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1555401457680 is an abundant number, since it is smaller than the sum of its proper divisors (3955163712624).

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

1555401457680 is a wasteful number, since it uses less digits than its factorization.

1555401457680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 925834224 (or 925834218 counting only the distinct ones).

The product of its (nonzero) digits is 3360000, while the sum is 51.

The spelling of 1555401457680 in words is "one trillion, five hundred fifty-five billion, four hundred one million, four hundred fifty-seven thousand, six hundred eighty".