61853867205 has 32 divisors (see below), whose sum is σ = 112188397440. Its totient is φ = 28848441600.

The previous prime is 61853867191. The next prime is 61853867219. The reversal of 61853867205 is 50276835816.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (61853867191) and next prime (61853867219).

It is not a de Polignac number, because 61853867205 - 2⁷ = 61853867077 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8343646 + ... + 8351055.

It is an arithmetic number, because the mean of its divisors is an integer number (3505887420).

Almost surely, 2^61853867205 is an apocalyptic number.

61853867205 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

61853867205 is a deficient number, since it is larger than the sum of its proper divisors (50334530235).

61853867205 is a wasteful number, since it uses less digits than its factorization.

61853867205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16694741.

The product of its (nonzero) digits is 2419200, while the sum is 51.

The spelling of 61853867205 in words is "sixty-one billion, eight hundred fifty-three million, eight hundred sixty-seven thousand, two hundred five".