51366645 has 48 divisors (see below), whose sum is σ = 99537984. Its totient is φ = 24288000.

The previous prime is 51366611. The next prime is 51366647. The reversal of 51366645 is 54666315.

It is not a de Polignac number, because 51366645 - 2⁷ = 51366517 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51366647) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19030 + ... + 21560.

It is an arithmetic number, because the mean of its divisors is an integer number (2073708).

Almost surely, 2^51366645 is an apocalyptic number.

51366645 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51366645 is a deficient number, since it is larger than the sum of its proper divisors (48171339).

51366645 is a wasteful number, since it uses less digits than its factorization.

51366645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2594 (or 2591 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 51366645 is about 7167.0527415389. The cubic root of 51366645 is about 371.7295337181.

It can be divided in two parts, 5136 and 6645, that added together give a triangular number (11781 = T₁₅₃).

The spelling of 51366645 in words is "fifty-one million, three hundred sixty-six thousand, six hundred forty-five".