155650661551553 has 6 divisors (see below), whose sum is σ = 181063014457986. Its totient is φ = 133414852758432.

The previous prime is 155650661551531. The next prime is 155650661551571. The reversal of 155650661551553 is 355155166056551.

It can be written as a sum of positive squares in only one way, i.e., 85015259818384 + 70635401733169 = 9220372^2 + 8404487^2 .

It is not a de Polignac number, because 155650661551553 - 2¹⁰ = 155650661550529 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 155650661551492 and 155650661551501.

It is not an unprimeable number, because it can be changed into a prime (155650661551513) 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, 1588272056600 + ... + 1588272056697.

It is an arithmetic number, because the mean of its divisors is an integer number (30177169076331).

Almost surely, 2^{155650661551553} is an apocalyptic number.

It is an amenable number.

155650661551553 is a deficient number, since it is larger than the sum of its proper divisors (25412352906433).

155650661551553 is an equidigital number, since it uses as much as digits as its factorization.

155650661551553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3176544113311 (or 3176544113304 counting only the distinct ones).

The product of its (nonzero) digits is 50625000, while the sum is 59.

The spelling of 155650661551553 in words is "one hundred fifty-five trillion, six hundred fifty billion, six hundred sixty-one million, five hundred fifty-one thousand, five hundred fifty-three".