155690493669 has 6 divisors (see below), whose sum is σ = 224886268646. Its totient is φ = 103793662440.

The previous prime is 155690493667. The next prime is 155690493713. The reversal of 155690493669 is 966394096551.

155690493669 is a `hidden beast` number, since 1 + 5 + 56 + 90 + 493 + 6 + 6 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 102022748100 + 53667745569 = 319410^2 + 231663^2 .

It is not a de Polignac number, because 155690493669 - 2¹ = 155690493667 is a prime.

It is a super-2 number, since 2×155690493669² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155690493667) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8649471862 + ... + 8649471879.

Almost surely, 2^155690493669 is an apocalyptic number.

It is an amenable number.

155690493669 is a deficient number, since it is larger than the sum of its proper divisors (69195774977).

155690493669 is a wasteful number, since it uses less digits than its factorization.

155690493669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17298943747 (or 17298943744 counting only the distinct ones).

The product of its (nonzero) digits is 47239200, while the sum is 63.

The spelling of 155690493669 in words is "one hundred fifty-five billion, six hundred ninety million, four hundred ninety-three thousand, six hundred sixty-nine".