149143781669 has 2 divisors, whose sum is σ = 149143781670. Its totient is φ = 149143781668.

The previous prime is 149143781627. The next prime is 149143781687. The reversal of 149143781669 is 966187341941.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136132957444 + 13010824225 = 368962^2 + 114065^2 .

It is a cyclic number.

It is not a de Polignac number, because 149143781669 - 2²⁰ = 149142733093 is a prime.

It is a super-2 number, since 2×149143781669² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (149143781869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74571890834 + 74571890835.

It is an arithmetic number, because the mean of its divisors is an integer number (74571890835).

Almost surely, 2^149143781669 is an apocalyptic number.

It is an amenable number.

149143781669 is a deficient number, since it is larger than the sum of its proper divisors (1).

149143781669 is an equidigital number, since it uses as much as digits as its factorization.

149143781669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7838208, while the sum is 59.

The spelling of 149143781669 in words is "one hundred forty-nine billion, one hundred forty-three million, seven hundred eighty-one thousand, six hundred sixty-nine".