51618966 has 16 divisors (see below), whose sum is σ = 117986304. Its totient is φ = 14748264.

The previous prime is 51618949. The next prime is 51618967. The reversal of 51618966 is 66981615.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 1229023 = 51618966 / (5 + 1 + 6 + 1 + 8 + 9 + 6 + 6).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51618967) 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, 614470 + ... + 614553.

It is an arithmetic number, because the mean of its divisors is an integer number (7374144).

Almost surely, 2^51618966 is an apocalyptic number.

51618966 is an abundant number, since it is smaller than the sum of its proper divisors (66367338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51618966 is a wasteful number, since it uses less digits than its factorization.

51618966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1229035.

The product of its digits is 77760, while the sum is 42.

The square root of 51618966 is about 7184.6340199067. The cubic root of 51618966 is about 372.3372043610.

The spelling of 51618966 in words is "fifty-one million, six hundred eighteen thousand, nine hundred sixty-six".