134621642681 has 2 divisors, whose sum is σ = 134621642682. Its totient is φ = 134621642680.

The previous prime is 134621642671. The next prime is 134621642693. The reversal of 134621642681 is 186246126431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120606871225 + 14014771456 = 347285^2 + 118384^2 .

It is a cyclic number.

It is not a de Polignac number, because 134621642681 - 2¹⁰ = 134621641657 is a prime.

It is a super-2 number, since 2×134621642681² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (134621642611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67310821340 + 67310821341.

It is an arithmetic number, because the mean of its divisors is an integer number (67310821341).

Almost surely, 2^134621642681 is an apocalyptic number.

It is an amenable number.

134621642681 is a deficient number, since it is larger than the sum of its proper divisors (1).

134621642681 is an equidigital number, since it uses as much as digits as its factorization.

134621642681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 331776, while the sum is 44.

The spelling of 134621642681 in words is "one hundred thirty-four billion, six hundred twenty-one million, six hundred forty-two thousand, six hundred eighty-one".