61665374 has 8 divisors (see below), whose sum is σ = 97366440. Its totient is φ = 29209896.

The previous prime is 61665371. The next prime is 61665389. The reversal of 61665374 is 47356616.

It is a happy number.

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

It is a Harshad number since it is a multiple of its sum of digits (38), and also a Moran number because the ratio is a prime number: 1622773 = 61665374 / (6 + 1 + 6 + 6 + 5 + 3 + 7 + 4).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61665371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 811349 + ... + 811424.

It is an arithmetic number, because the mean of its divisors is an integer number (12170805).

Almost surely, 2^61665374 is an apocalyptic number.

61665374 is a deficient number, since it is larger than the sum of its proper divisors (35701066).

61665374 is a wasteful number, since it uses less digits than its factorization.

61665374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1622794.

The product of its digits is 90720, while the sum is 38.

The square root of 61665374 is about 7852.7303531956. The cubic root of 61665374 is about 395.0758258534.

The spelling of 61665374 in words is "sixty-one million, six hundred sixty-five thousand, three hundred seventy-four".