61600018555 has 4 divisors (see below), whose sum is σ = 73920022272. Its totient is φ = 49280014840.

The previous prime is 61600018547. The next prime is 61600018573. The reversal of 61600018555 is 55581000616.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 61600018555 - 2³ = 61600018547 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6160001851 + ... + 6160001860.

It is an arithmetic number, because the mean of its divisors is an integer number (18480005568).

Almost surely, 2^61600018555 is an apocalyptic number.

61600018555 is a deficient number, since it is larger than the sum of its proper divisors (12320003717).

61600018555 is a wasteful number, since it uses less digits than its factorization.

61600018555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12320003716.

The product of its (nonzero) digits is 36000, while the sum is 37.

The spelling of 61600018555 in words is "sixty-one billion, six hundred million, eighteen thousand, five hundred fifty-five".