61918799 has 8 divisors (see below), whose sum is σ = 64158960. Its totient is φ = 59685696.

The previous prime is 61918771. The next prime is 61918807. The reversal of 61918799 is 99781916.

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 61918799 - 2¹⁶ = 61853263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61918729) 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, 21467 + ... + 24179.

It is an arithmetic number, because the mean of its divisors is an integer number (8019870).

Almost surely, 2^61918799 is an apocalyptic number.

61918799 is a deficient number, since it is larger than the sum of its proper divisors (2240161).

61918799 is a wasteful number, since it uses less digits than its factorization.

61918799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3529.

The product of its digits is 244944, while the sum is 50.

The square root of 61918799 is about 7868.8499159661. The cubic root of 61918799 is about 395.6162979767.

The spelling of 61918799 in words is "sixty-one million, nine hundred eighteen thousand, seven hundred ninety-nine".