2153161301661 has 12 divisors (see below), whose sum is σ = 3168803425788. Its totient is φ = 1408357077504.

The previous prime is 2153161301653. The next prime is 2153161301689. The reversal of 2153161301661 is 1661031613512.

2153161301661 is a `hidden beast` number, since 2 + 1 + 5 + 31 + 613 + 0 + 1 + 6 + 6 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1867691223225 + 285470078436 = 1366635^2 + 534294^2 .

It is not a de Polignac number, because 2153161301661 - 2³ = 2153161301653 is a prime.

It is a super-2 number, since 2×2153161301661² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2153161301651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2256982020 + ... + 2256982973.

It is an arithmetic number, because the mean of its divisors is an integer number (264066952149).

Almost surely, 2^{2153161301661} is an apocalyptic number.

It is an amenable number.

2153161301661 is a deficient number, since it is larger than the sum of its proper divisors (1015642124127).

2153161301661 is a wasteful number, since it uses less digits than its factorization.

2153161301661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4513965052 (or 4513965049 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The spelling of 2153161301661 in words is "two trillion, one hundred fifty-three billion, one hundred sixty-one million, three hundred one thousand, six hundred sixty-one".