1555740475551 has 32 divisors (see below), whose sum is σ = 2313884664000. Its totient is φ = 1033078924800.

The previous prime is 1555740475547. The next prime is 1555740475571.

1555740475551 is a `hidden beast` number, since 1 + 5 + 5 + 5 + 7 + 40 + 47 + 5 + 551 = 666.

1555740475551 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1555740475551 - 2² = 1555740475547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555740475571) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8741251 + ... + 8917451.

It is an arithmetic number, because the mean of its divisors is an integer number (72308895750).

Almost surely, 2^{1555740475551} is an apocalyptic number.

1555740475551 is a deficient number, since it is larger than the sum of its proper divisors (758144188449).

1555740475551 is a wasteful number, since it uses less digits than its factorization.

1555740475551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177496 (or 177490 counting only the distinct ones).

The product of its (nonzero) digits is 12250000, while the sum is 54.

The spelling of 1555740475551 in words is "one trillion, five hundred fifty-five billion, seven hundred forty million, four hundred seventy-five thousand, five hundred fifty-one".