61918805 has 8 divisors (see below), whose sum is σ = 80018232. Its totient is φ = 45724608.

The previous prime is 61918771. The next prime is 61918807. The reversal of 61918805 is 50881916.

It can be written as a sum of positive squares in 4 ways, for example, as 343396 + 61575409 = 586^2 + 7847^2 .

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 61918805 - 2²⁴ = 45141589 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 (61918807) 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, 476234 + ... + 476363.

It is an arithmetic number, because the mean of its divisors is an integer number (10002279).

Almost surely, 2^61918805 is an apocalyptic number.

61918805 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

61918805 is a deficient number, since it is larger than the sum of its proper divisors (18099427).

61918805 is a wasteful number, since it uses less digits than its factorization.

61918805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952615.

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 61918805 is about 7868.8502972162. The cubic root of 61918805 is about 395.6163107552.

The spelling of 61918805 in words is "sixty-one million, nine hundred eighteen thousand, eight hundred five".