61646761 has 4 divisors (see below), whose sum is σ = 67251024. Its totient is φ = 56042500.

The previous prime is 61646749. The next prime is 61646771. The reversal of 61646761 is 16764616.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61646761 - 2⁵ = 61646729 is a prime.

It is a super-2 number, since 2×61646761² = 7600646283582242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61646761.

It is not an unprimeable number, because it can be changed into a prime (61646771) 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, 2802115 + ... + 2802136.

It is an arithmetic number, because the mean of its divisors is an integer number (16812756).

Almost surely, 2^61646761 is an apocalyptic number.

It is an amenable number.

61646761 is a deficient number, since it is larger than the sum of its proper divisors (5604263).

61646761 is a wasteful number, since it uses less digits than its factorization.

61646761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5604262.

The product of its digits is 36288, while the sum is 37.

The square root of 61646761 is about 7851.5451345579. The cubic root of 61646761 is about 395.0360721210.

The spelling of 61646761 in words is "sixty-one million, six hundred forty-six thousand, seven hundred sixty-one".