51663386 has 4 divisors (see below), whose sum is σ = 77495082. Its totient is φ = 25831692.

The previous prime is 51663383. The next prime is 51663389. The reversal of 51663386 is 68336615.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (51663383) and next prime (51663389).

It can be written as a sum of positive squares in only one way, i.e., 50908225 + 755161 = 7135^2 + 869^2 .

It is not an unprimeable number, because it can be changed into a prime (51663383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12915845 + ... + 12915848.

Almost surely, 2^51663386 is an apocalyptic number.

51663386 is a deficient number, since it is larger than the sum of its proper divisors (25831696).

51663386 is a wasteful number, since it uses less digits than its factorization.

51663386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25831695.

The product of its digits is 77760, while the sum is 38.

The square root of 51663386 is about 7187.7246747493. The cubic root of 51663386 is about 372.4439769808.

The spelling of 51663386 in words is "fifty-one million, six hundred sixty-three thousand, three hundred eighty-six".