155500551 has 12 divisors (see below), whose sum is σ = 226229640. Its totient is φ = 102920400.

The previous prime is 155500511. The next prime is 155500607. The reversal of 155500551 is 155005551.

155500551 is a `hidden beast` number, since 155 + 500 + 5 + 5 + 1 = 666.

It is not a de Polignac number, because 155500551 - 2¹¹ = 155498503 is a prime.

It is a super-2 number, since 2×155500551² = 48360842722607202, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155500511) 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, 60900 + ... + 63401.

It is an arithmetic number, because the mean of its divisors is an integer number (18852470).

Almost surely, 2^155500551 is an apocalyptic number.

155500551 is a deficient number, since it is larger than the sum of its proper divisors (70729089).

155500551 is a wasteful number, since it uses less digits than its factorization.

155500551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124446 (or 124443 counting only the distinct ones).

The product of its (nonzero) digits is 3125, while the sum is 27.

The square root of 155500551 is about 12469.9860064075. The cubic root of 155500551 is about 537.7461512549.

The spelling of 155500551 in words is "one hundred fifty-five million, five hundred thousand, five hundred fifty-one".