155211642555 has 16 divisors (see below), whose sum is σ = 259135960320. Its totient is φ = 79180431968.

The previous prime is 155211642541. The next prime is 155211642559. The reversal of 155211642555 is 555246112551.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 155211642555 - 2⁷ = 155211642427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155211642559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 224944065 + ... + 224944754.

It is an arithmetic number, because the mean of its divisors is an integer number (16195997520).

Almost surely, 2^155211642555 is an apocalyptic number.

155211642555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

155211642555 is a deficient number, since it is larger than the sum of its proper divisors (103924317765).

155211642555 is a wasteful number, since it uses less digits than its factorization.

155211642555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449888850.

The product of its digits is 300000, while the sum is 42.

The spelling of 155211642555 in words is "one hundred fifty-five billion, two hundred eleven million, six hundred forty-two thousand, five hundred fifty-five".