155512454121 has 12 divisors (see below), whose sum is σ = 232948697072. Its totient is φ = 103674969252.

The previous prime is 155512454099. The next prime is 155512454131. The reversal of 155512454121 is 121454215551.

155512454121 is a `hidden beast` number, since 1 + 5 + 551 + 2 + 45 + 41 + 21 = 666.

It is not a de Polignac number, because 155512454121 - 2²⁵ = 155478899689 is a prime.

It is a super-2 number, since 2×155512454121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155512454131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 319984231 + ... + 319984716.

Almost surely, 2^155512454121 is an apocalyptic number.

It is an amenable number.

155512454121 is a deficient number, since it is larger than the sum of its proper divisors (77436242951).

155512454121 is an frugal number, since it uses more digits than its factorization.

155512454121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639968962 (or 639968950 counting only the distinct ones).

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

Adding to 155512454121 its reverse (121454215551), we get a palindrome (276966669672).

The spelling of 155512454121 in words is "one hundred fifty-five billion, five hundred twelve million, four hundred fifty-four thousand, one hundred twenty-one".