155655100009 has 2 divisors, whose sum is σ = 155655100010. Its totient is φ = 155655100008.

The previous prime is 155655099997. The next prime is 155655100061. The reversal of 155655100009 is 900001556551.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153936168409 + 1718931600 = 392347^2 + 41460^2 .

It is a cyclic number.

It is not a de Polignac number, because 155655100009 - 2²⁵ = 155621545577 is a prime.

It is not a weakly prime, because it can be changed into another prime (155655100079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77827550004 + 77827550005.

It is an arithmetic number, because the mean of its divisors is an integer number (77827550005).

Almost surely, 2^155655100009 is an apocalyptic number.

It is an amenable number.

155655100009 is a deficient number, since it is larger than the sum of its proper divisors (1).

155655100009 is an equidigital number, since it uses as much as digits as its factorization.

155655100009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 33750, while the sum is 37.

The spelling of 155655100009 in words is "one hundred fifty-five billion, six hundred fifty-five million, one hundred thousand, nine".