551615625 has 72 divisors (see below), whose sum is σ = 1087055424. Its totient is φ = 267300000.

The previous prime is 551615621. The next prime is 551615627. The reversal of 551615625 is 526516155.

551615625 is a `hidden beast` number, since 5 + 5 + 16 + 15 + 625 = 666.

It is not a de Polignac number, because 551615625 - 2² = 551615621 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 551615625.

It is not an unprimeable number, because it can be changed into a prime (551615621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 308484 + ... + 310266.

It is an arithmetic number, because the mean of its divisors is an integer number (15097992).

Almost surely, 2^551615625 is an apocalyptic number.

551615625 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

551615625 is a deficient number, since it is larger than the sum of its proper divisors (535439799).

551615625 is a wasteful number, since it uses less digits than its factorization.

551615625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1825 (or 1802 counting only the distinct ones).

The product of its digits is 45000, while the sum is 36.

The square root of 551615625 is about 23486.4987812147. The cubic root of 551615625 is about 820.1227384191.

It can be divided in two parts, 5516156 and 25, that added together give a triangular number (5516181 = T₃₃₂₁).

The spelling of 551615625 in words is "five hundred fifty-one million, six hundred fifteen thousand, six hundred twenty-five".