155661436311115 has 16 divisors (see below), whose sum is σ = 213510706460352. Its totient is φ = 106723187996544.

The previous prime is 155661436311109. The next prime is 155661436311127. The reversal of 155661436311115 is 511113634166551.

It is not a de Polignac number, because 155661436311115 - 2¹⁵ = 155661436278347 is a prime.

It is a super-2 number, since 2×155661436311115² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 334818904 + ... + 335283493.

It is an arithmetic number, because the mean of its divisors is an integer number (13344419153772).

Almost surely, 2^{155661436311115} is an apocalyptic number.

155661436311115 is a deficient number, since it is larger than the sum of its proper divisors (57849270149237).

155661436311115 is an equidigital number, since it uses as much as digits as its factorization.

155661436311115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670109046.

The product of its digits is 972000, while the sum is 49.

The spelling of 155661436311115 in words is "one hundred fifty-five trillion, six hundred sixty-one billion, four hundred thirty-six million, three hundred eleven thousand, one hundred fifteen".