61667751 has 8 divisors (see below), whose sum is σ = 82593280. Its totient is φ = 40927032.

The previous prime is 61667743. The next prime is 61667759. The reversal of 61667751 is 15776616.

It is an interprime number because it is at equal distance from previous prime (61667743) and next prime (61667759).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61667751 - 2³ = 61667743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61667759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45421 + ... + 46758.

It is an arithmetic number, because the mean of its divisors is an integer number (10324160).

Almost surely, 2^61667751 is an apocalyptic number.

61667751 is a deficient number, since it is larger than the sum of its proper divisors (20925529).

61667751 is a wasteful number, since it uses less digits than its factorization.

61667751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92405.

The product of its digits is 52920, while the sum is 39.

The square root of 61667751 is about 7852.8817003696. The cubic root of 61667751 is about 395.0809020851.

The spelling of 61667751 in words is "sixty-one million, six hundred sixty-seven thousand, seven hundred fifty-one".