51666741 has 40 divisors (see below), whose sum is σ = 88792704. Its totient is φ = 29328480.

The previous prime is 51666737. The next prime is 51666767. The reversal of 51666741 is 14766615.

It is not a de Polignac number, because 51666741 - 2² = 51666737 is a prime.

It is a super-2 number, since 2×51666741² = 5338904251122162, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51666696 and 51666705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51666941) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 165976 + ... + 166286.

Almost surely, 2^51666741 is an apocalyptic number.

It is an amenable number.

51666741 is a deficient number, since it is larger than the sum of its proper divisors (37125963).

51666741 is a wasteful number, since it uses less digits than its factorization.

51666741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623 (or 614 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 51666741 is about 7187.9580549694. The cubic root of 51666741 is about 372.4520389281.

The spelling of 51666741 in words is "fifty-one million, six hundred sixty-six thousand, seven hundred forty-one".