155540045551 has 8 divisors (see below), whose sum is σ = 171360051408. Its totient is φ = 140000040000.

The previous prime is 155540045533. The next prime is 155540045603.

155540045551 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 155540045551 - 2¹⁵ = 155540012783 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 (155540025551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69998910 + ... + 70001131.

It is an arithmetic number, because the mean of its divisors is an integer number (21420006426).

Almost surely, 2^155540045551 is an apocalyptic number.

155540045551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

155540045551 is a deficient number, since it is larger than the sum of its proper divisors (15820005857).

155540045551 is a wasteful number, since it uses less digits than its factorization.

155540045551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140000153.

The product of its (nonzero) digits is 250000, while the sum is 40.

The spelling of 155540045551 in words is "one hundred fifty-five billion, five hundred forty million, forty-five thousand, five hundred fifty-one".