61662145 has 8 divisors (see below), whose sum is σ = 78347304. Its totient is φ = 46427904.

The previous prime is 61662127. The next prime is 61662157. The reversal of 61662145 is 54126616.

It can be written as a sum of positive squares in 4 ways, for example, as 7595536 + 54066609 = 2756^2 + 7353^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 61662145 - 2⁵ = 61662113 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 362634 + ... + 362803.

It is an arithmetic number, because the mean of its divisors is an integer number (9793413).

Almost surely, 2^61662145 is an apocalyptic number.

It is an amenable number.

61662145 is a deficient number, since it is larger than the sum of its proper divisors (16685159).

61662145 is a wasteful number, since it uses less digits than its factorization.

61662145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725459.

The product of its digits is 8640, while the sum is 31.

The square root of 61662145 is about 7852.5247532243. The cubic root of 61662145 is about 395.0689299137.

The spelling of 61662145 in words is "sixty-one million, six hundred sixty-two thousand, one hundred forty-five".