61669564 has 24 divisors (see below), whose sum is σ = 117932976. Its totient is φ = 27984000.

The previous prime is 61669561. The next prime is 61669567. The reversal of 61669564 is 46596616.

It is an interprime number because it is at equal distance from previous prime (61669561) and next prime (61669567).

It is a self number, because there is not a number n which added to its sum of digits gives 61669564.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61669561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46024 + ... + 47344.

It is an arithmetic number, because the mean of its divisors is an integer number (4913874).

Almost surely, 2^61669564 is an apocalyptic number.

It is an amenable number.

61669564 is a deficient number, since it is larger than the sum of its proper divisors (56263412).

61669564 is a wasteful number, since it uses less digits than its factorization.

61669564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2397 (or 2395 counting only the distinct ones).

The product of its digits is 233280, while the sum is 43.

The square root of 61669564 is about 7852.9971348524. The cubic root of 61669564 is about 395.0847737719.

The spelling of 61669564 in words is "sixty-one million, six hundred sixty-nine thousand, five hundred sixty-four".