155542514121 has 48 divisors (see below), whose sum is σ = 232370012160. Its totient is φ = 100183340160.

The previous prime is 155542514111. The next prime is 155542514123. The reversal of 155542514121 is 121415245551.

155542514121 is a `hidden beast` number, since 1 + 5 + 5 + 542 + 51 + 41 + 21 = 666.

It is not a de Polignac number, because 155542514121 - 2⁷ = 155542513993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155542514123) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 73680856 + ... + 73682966.

It is an arithmetic number, because the mean of its divisors is an integer number (4841041920).

Almost surely, 2^155542514121 is an apocalyptic number.

It is an amenable number.

155542514121 is a deficient number, since it is larger than the sum of its proper divisors (76827498039).

155542514121 is a wasteful number, since it uses less digits than its factorization.

155542514121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3606 (or 3603 counting only the distinct ones).

The product of its digits is 40000, while the sum is 36.

Adding to 155542514121 its reverse (121415245551), we get a palindrome (276957759672).

The spelling of 155542514121 in words is "one hundred fifty-five billion, five hundred forty-two million, five hundred fourteen thousand, one hundred twenty-one".