155105279999 has 32 divisors (see below), whose sum is σ = 168256819200. Its totient is φ = 142635790080.

The previous prime is 155105279981. The next prime is 155105280007. The reversal of 155105279999 is 999972501551.

It is not a de Polignac number, because 155105279999 - 2⁸ = 155105279743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155105279299) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34320662 + ... + 34325180.

It is an arithmetic number, because the mean of its divisors is an integer number (5258025600).

Almost surely, 2^155105279999 is an apocalyptic number.

155105279999 is a deficient number, since it is larger than the sum of its proper divisors (13151539201).

155105279999 is a wasteful number, since it uses less digits than its factorization.

155105279999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5175.

The product of its (nonzero) digits is 11481750, while the sum is 62.

The spelling of 155105279999 in words is "one hundred fifty-five billion, one hundred five million, two hundred seventy-nine thousand, nine hundred ninety-nine".