61666351 has 2 divisors, whose sum is σ = 61666352. Its totient is φ = 61666350.

The previous prime is 61666349. The next prime is 61666393. The reversal of 61666351 is 15366616.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61666351 - 2¹ = 61666349 is a prime.

Together with 61666349, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61666301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30833175 + 30833176.

It is an arithmetic number, because the mean of its divisors is an integer number (30833176).

Almost surely, 2^61666351 is an apocalyptic number.

61666351 is a deficient number, since it is larger than the sum of its proper divisors (1).

61666351 is an equidigital number, since it uses as much as digits as its factorization.

61666351 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 34.

The square root of 61666351 is about 7852.7925606118. The cubic root of 61666351 is about 395.0779123136.

The spelling of 61666351 in words is "sixty-one million, six hundred sixty-six thousand, three hundred fifty-one".