61164661 has 4 divisors (see below), whose sum is σ = 62656524. Its totient is φ = 59672800.

The previous prime is 61164637. The next prime is 61164671. The reversal of 61164661 is 16646116.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8964036 + 52200625 = 2994^2 + 7225^2 .

It is a cyclic number.

It is not a de Polignac number, because 61164661 - 2⁹ = 61164149 is a prime.

It is a super-2 number, since 2×61164661² = 7482231510489842, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61164601) 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, 745870 + ... + 745951.

It is an arithmetic number, because the mean of its divisors is an integer number (15664131).

Almost surely, 2^61164661 is an apocalyptic number.

It is an amenable number.

61164661 is a deficient number, since it is larger than the sum of its proper divisors (1491863).

61164661 is a wasteful number, since it uses less digits than its factorization.

61164661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1491862.

The product of its digits is 5184, while the sum is 31.

The square root of 61164661 is about 7820.7839121152. The cubic root of 61164661 is about 394.0036009359.

The spelling of 61164661 in words is "sixty-one million, one hundred sixty-four thousand, six hundred sixty-one".