121955152555 has 16 divisors (see below), whose sum is σ = 149110841088. Its totient is φ = 95734044000.

The previous prime is 121955152531. The next prime is 121955152589. The reversal of 121955152555 is 555251559121.

It is not a de Polignac number, because 121955152555 - 2³¹ = 119807668907 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 739161 + ... + 888970.

It is an arithmetic number, because the mean of its divisors is an integer number (9319427568).

Almost surely, 2^121955152555 is an apocalyptic number.

121955152555 is a deficient number, since it is larger than the sum of its proper divisors (27155688533).

121955152555 is a wasteful number, since it uses less digits than its factorization.

121955152555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1628418.

The product of its digits is 562500, while the sum is 46.

The spelling of 121955152555 in words is "one hundred twenty-one billion, nine hundred fifty-five million, one hundred fifty-two thousand, five hundred fifty-five".