155561000551 has 8 divisors (see below), whose sum is σ = 170650972800. Its totient is φ = 140629038840.

The previous prime is 155561000537. The next prime is 155561000563. The reversal of 155561000551 is 155000165551.

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 155561000551 - 2¹³ = 155560992359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155561000351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39500571 + ... + 39504508.

It is an arithmetic number, because the mean of its divisors is an integer number (21331371600).

Almost surely, 2^155561000551 is an apocalyptic number.

155561000551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

155561000551 is a deficient number, since it is larger than the sum of its proper divisors (15089972249).

155561000551 is a wasteful number, since it uses less digits than its factorization.

155561000551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79005269.

The product of its (nonzero) digits is 18750, while the sum is 34.

The spelling of 155561000551 in words is "one hundred fifty-five billion, five hundred sixty-one million, five hundred fifty-one", and thus it is an aban number.