1678142061 has 6 divisors (see below), whose sum is σ = 2423982990. Its totient is φ = 1118761368.

The previous prime is 1678142047. The next prime is 1678142069. The reversal of 1678142061 is 1602418761.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1639764036 + 38378025 = 40494^2 + 6195^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1678142061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1678142069) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 93230106 + ... + 93230123.

It is an arithmetic number, because the mean of its divisors is an integer number (403997165).

Almost surely, 2^1678142061 is an apocalyptic number.

It is an amenable number.

1678142061 is a deficient number, since it is larger than the sum of its proper divisors (745840929).

1678142061 is a wasteful number, since it uses less digits than its factorization.

1678142061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186460235 (or 186460232 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 1678142061 is about 40965.1322590322. The cubic root of 1678142061 is about 1188.3459969831.

The spelling of 1678142061 in words is "one billion, six hundred seventy-eight million, one hundred forty-two thousand, sixty-one".