61669143 has 6 divisors (see below), whose sum is σ = 89077664. Its totient is φ = 41112756.

The previous prime is 61669133. The next prime is 61669147. The reversal of 61669143 is 34196616.

It is not a de Polignac number, because 61669143 - 2⁹ = 61668631 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61669098 and 61669107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61669147) 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, 3426055 + ... + 3426072.

Almost surely, 2^61669143 is an apocalyptic number.

61669143 is a deficient number, since it is larger than the sum of its proper divisors (27408521).

61669143 is a wasteful number, since it uses less digits than its factorization.

61669143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6852133 (or 6852130 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 61669143 is about 7852.9703297542. The cubic root of 61669143 is about 395.0838747273.

The spelling of 61669143 in words is "sixty-one million, six hundred sixty-nine thousand, one hundred forty-three".