61580069 has 4 divisors (see below), whose sum is σ = 65202444. Its totient is φ = 57957696.

The previous prime is 61580059. The next prime is 61580111. The reversal of 61580069 is 96008516.

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 20811844 + 40768225 = 4562^2 + 6385^2 .

It is a cyclic number.

It is not a de Polignac number, because 61580069 - 2⁴ = 61580053 is a prime.

It is a super-2 number, since 2×61580069² = 7584209796089522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61580009) 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, 1811162 + ... + 1811195.

It is an arithmetic number, because the mean of its divisors is an integer number (16300611).

Almost surely, 2^61580069 is an apocalyptic number.

It is an amenable number.

61580069 is a deficient number, since it is larger than the sum of its proper divisors (3622375).

61580069 is a wasteful number, since it uses less digits than its factorization.

61580069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3622374.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 61580069 is about 7847.2969231449. The cubic root of 61580069 is about 394.8935652985.

The spelling of 61580069 in words is "sixty-one million, five hundred eighty thousand, sixty-nine".