61766641 has 4 divisors (see below), whose sum is σ = 61888500. Its totient is φ = 61644784.

The previous prime is 61766633. The next prime is 61766659. The reversal of 61766641 is 14666716.

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 29322225 + 32444416 = 5415^2 + 5696^2 .

It is a cyclic number.

It is not a de Polignac number, because 61766641 - 2³ = 61766633 is a prime.

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 61766641.

It is not an unprimeable number, because it can be changed into a prime (61766611) 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, 60166 + ... + 61183.

It is an arithmetic number, because the mean of its divisors is an integer number (15472125).

Almost surely, 2^61766641 is an apocalyptic number.

It is an amenable number.

61766641 is a deficient number, since it is larger than the sum of its proper divisors (121859).

61766641 is a wasteful number, since it uses less digits than its factorization.

61766641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121858.

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

The square root of 61766641 is about 7859.1755928978. The cubic root of 61766641 is about 395.2919723472.

The spelling of 61766641 in words is "sixty-one million, seven hundred sixty-six thousand, six hundred forty-one".