51666000543442 has 16 divisors (see below), whose sum is σ = 79691953624920. Its totient is φ = 25103742058368.

The previous prime is 51666000543427. The next prime is 51666000543457. The reversal of 51666000543442 is 24434500066615.

It is an interprime number because it is at equal distance from previous prime (51666000543427) and next prime (51666000543457).

It can be written as a sum of positive squares in 4 ways, for example, as 51659710625961 + 6289917481 = 7187469^2 + 79309^2 .

It is a super-2 number, since 2×51666000543442² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51666000543392 and 51666000543401.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 431453853 + ... + 431573584.

Almost surely, 2^{51666000543442} is an apocalyptic number.

51666000543442 is a deficient number, since it is larger than the sum of its proper divisors (28025953081478).

51666000543442 is a wasteful number, since it uses less digits than its factorization.

51666000543442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 863028285.

The product of its (nonzero) digits is 2073600, while the sum is 46.

The spelling of 51666000543442 in words is "fifty-one trillion, six hundred sixty-six billion, five hundred forty-three thousand, four hundred forty-two".