61559779 has 8 divisors (see below), whose sum is σ = 63790560. Its totient is φ = 59336256.

The previous prime is 61559767. The next prime is 61559783. The reversal of 61559779 is 97795516.

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 61559779 - 2¹³ = 61551587 is a prime.

It is a super-4 number, since 4×61559779⁴ (a number of 32 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61559759) 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, 20119 + ... + 22975.

It is an arithmetic number, because the mean of its divisors is an integer number (7973820).

Almost surely, 2^61559779 is an apocalyptic number.

61559779 is a deficient number, since it is larger than the sum of its proper divisors (2230781).

61559779 is a wasteful number, since it uses less digits than its factorization.

61559779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3629.

The product of its digits is 595350, while the sum is 49.

The square root of 61559779 is about 7846.0040147836. The cubic root of 61559779 is about 394.8501894101.

The spelling of 61559779 in words is "sixty-one million, five hundred fifty-nine thousand, seven hundred seventy-nine".