42847155752666 has 4 divisors (see below), whose sum is σ = 64270733629002. Its totient is φ = 21423577876332.

The previous prime is 42847155752647. The next prime is 42847155752671. The reversal of 42847155752666 is 66625755174824.

It is a happy number.

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., 24590976827041 + 18256178925625 = 4958929^2 + 4272725^2 .

It is a super-2 number, since 2×42847155752666² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42847155752596 and 42847155752605.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10711788938165 + ... + 10711788938168.

Almost surely, 2^{42847155752666} is an apocalyptic number.

42847155752666 is a deficient number, since it is larger than the sum of its proper divisors (21423577876336).

42847155752666 is a wasteful number, since it uses less digits than its factorization.

42847155752666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21423577876335.

The product of its digits is 677376000, while the sum is 68.

The spelling of 42847155752666 in words is "forty-two trillion, eight hundred forty-seven billion, one hundred fifty-five million, seven hundred fifty-two thousand, six hundred sixty-six".