1655787161601 has 12 divisors (see below), whose sum is σ = 2392473950100. Its totient is φ = 1103497469280.

The previous prime is 1655787161557. The next prime is 1655787161627. The reversal of 1655787161601 is 1061617875561.

1655787161601 is a `hidden beast` number, since 1 + 6 + 5 + 578 + 7 + 1 + 6 + 1 + 60 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1442398598001 + 213388563600 = 1200999^2 + 461940^2 .

It is not a de Polignac number, because 1655787161601 - 2¹⁴ = 1655787145217 is a prime.

It is a super-2 number, since 2×1655787161601² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1655787161401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30024126 + ... + 30079223.

It is an arithmetic number, because the mean of its divisors is an integer number (199372829175).

Almost surely, 2^{1655787161601} is an apocalyptic number.

It is an amenable number.

1655787161601 is a deficient number, since it is larger than the sum of its proper divisors (736686788499).

1655787161601 is a wasteful number, since it uses less digits than its factorization.

1655787161601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60106416 (or 60106413 counting only the distinct ones).

The product of its (nonzero) digits is 2116800, while the sum is 54.

The spelling of 1655787161601 in words is "one trillion, six hundred fifty-five billion, seven hundred eighty-seven million, one hundred sixty-one thousand, six hundred one".