1205243405155 has 32 divisors (see below), whose sum is σ = 1460163188736. Its totient is φ = 954990000000.

The previous prime is 1205243405143. The next prime is 1205243405167. The reversal of 1205243405155 is 5515043425021.

It is an interprime number because it is at equal distance from previous prime (1205243405143) and next prime (1205243405167).

It is not a de Polignac number, because 1205243405155 - 2⁹ = 1205243404643 is a prime.

It is a super-2 number, since 2×1205243405155² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 459839745 + ... + 459842365.

It is an arithmetic number, because the mean of its divisors is an integer number (45630099648).

Almost surely, 2^{1205243405155} is an apocalyptic number.

1205243405155 is a deficient number, since it is larger than the sum of its proper divisors (254919783581).

1205243405155 is a wasteful number, since it uses less digits than its factorization.

1205243405155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4339.

The product of its (nonzero) digits is 120000, while the sum is 37.

The spelling of 1205243405155 in words is "one trillion, two hundred five billion, two hundred forty-three million, four hundred five thousand, one hundred fifty-five".