1260521137161 has 128 divisors (see below), whose sum is σ = 2317864550400. Its totient is φ = 666380494080.

The previous prime is 1260521137147. The next prime is 1260521137171. The reversal of 1260521137161 is 1617311250621.

1260521137161 is a `hidden beast` number, since 1 + 2 + 6 + 0 + 521 + 1 + 3 + 71 + 61 = 666.

It is not a de Polignac number, because 1260521137161 - 2¹¹ = 1260521135113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1260521137171) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 5142780 + ... + 5382306.

It is an arithmetic number, because the mean of its divisors is an integer number (18108316800).

Almost surely, 2^{1260521137161} is an apocalyptic number.

1260521137161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1260521137161 is a deficient number, since it is larger than the sum of its proper divisors (1057343413239).

1260521137161 is a wasteful number, since it uses less digits than its factorization.

1260521137161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239636 (or 239630 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

Adding to 1260521137161 its reverse (1617311250621), we get a palindrome (2877832387782).

The spelling of 1260521137161 in words is "one trillion, two hundred sixty billion, five hundred twenty-one million, one hundred thirty-seven thousand, one hundred sixty-one".