155561171567 has 32 divisors (see below), whose sum is σ = 169333161984. Its totient is φ = 142347110400.

The previous prime is 155561171561. The next prime is 155561171573. The reversal of 155561171567 is 765171165551.

It is an interprime number because it is at equal distance from previous prime (155561171561) and next prime (155561171573).

It is a cyclic number.

It is not a de Polignac number, because 155561171567 - 2⁴ = 155561171551 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 (155561171561) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 156973442 + ... + 156974432.

It is an arithmetic number, because the mean of its divisors is an integer number (5291661312).

Almost surely, 2^155561171567 is an apocalyptic number.

155561171567 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

155561171567 is a deficient number, since it is larger than the sum of its proper divisors (13771990417).

155561171567 is a wasteful number, since it uses less digits than its factorization.

155561171567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2159.

The product of its digits is 1102500, while the sum is 50.

The spelling of 155561171567 in words is "one hundred fifty-five billion, five hundred sixty-one million, one hundred seventy-one thousand, five hundred sixty-seven".