61564669 has 8 divisors (see below), whose sum is σ = 62550432. Its totient is φ = 60584880.

The previous prime is 61564661. The next prime is 61564681. The reversal of 61564669 is 96646516.

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 61564669 - 2³ = 61564661 is a prime.

It is a super-2 number, since 2×61564669² = 7580416938159122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61564661) 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, 22179 + ... + 24799.

It is an arithmetic number, because the mean of its divisors is an integer number (7818804).

Almost surely, 2^61564669 is an apocalyptic number.

It is an amenable number.

61564669 is a deficient number, since it is larger than the sum of its proper divisors (985763).

61564669 is a wasteful number, since it uses less digits than its factorization.

61564669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2987.

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

The square root of 61564669 is about 7846.3156321932. The cubic root of 61564669 is about 394.8606441060.

The spelling of 61564669 in words is "sixty-one million, five hundred sixty-four thousand, six hundred sixty-nine".