61616011778 has 8 divisors (see below), whose sum is σ = 94390486272. Its totient is φ = 30152516356.

The previous prime is 61616011763. The next prime is 61616011799. The reversal of 61616011778 is 87711061616.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon 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, 327744650 + ... + 327744837.

It is an arithmetic number, because the mean of its divisors is an integer number (11798810784).

Almost surely, 2^61616011778 is an apocalyptic number.

61616011778 is a deficient number, since it is larger than the sum of its proper divisors (32774474494).

61616011778 is a wasteful number, since it uses less digits than its factorization.

61616011778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655489536.

The product of its (nonzero) digits is 84672, while the sum is 44.

The spelling of 61616011778 in words is "sixty-one billion, six hundred sixteen million, eleven thousand, seven hundred seventy-eight".