51377866 has 4 divisors (see below), whose sum is σ = 77066802. Its totient is φ = 25688932.

The previous prime is 51377863. The next prime is 51377873. The reversal of 51377866 is 66877315.

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

It can be written as a sum of positive squares in only one way, i.e., 50112241 + 1265625 = 7079^2 + 1125^2 .

It is a super-2 number, since 2×51377866² = 5279370229427912, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51377863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12844465 + ... + 12844468.

Almost surely, 2^51377866 is an apocalyptic number.

51377866 is a deficient number, since it is larger than the sum of its proper divisors (25688936).

51377866 is a wasteful number, since it uses less digits than its factorization.

51377866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25688935.

The product of its digits is 211680, while the sum is 43.

The square root of 51377866 is about 7167.8355170860. The cubic root of 51377866 is about 371.7565997477.

The spelling of 51377866 in words is "fifty-one million, three hundred seventy-seven thousand, eight hundred sixty-six".