778555061 has 8 divisors (see below), whose sum is σ = 786886464. Its totient is φ = 770238720.

The previous prime is 778555051. The next prime is 778555097. The reversal of 778555061 is 160555877.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-778555061 is a prime.

It is a super-2 number, since 2×778555061² = 1212295966017427442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778555031) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 122246 + ... + 128456.

It is an arithmetic number, because the mean of its divisors is an integer number (98360808).

Almost surely, 2^778555061 is an apocalyptic number.

It is an amenable number.

778555061 is a deficient number, since it is larger than the sum of its proper divisors (8331403).

778555061 is a wasteful number, since it uses less digits than its factorization.

778555061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7531.

The product of its (nonzero) digits is 294000, while the sum is 44.

The square root of 778555061 is about 27902.5995383943. The cubic root of 778555061 is about 919.9476423417.

The spelling of 778555061 in words is "seven hundred seventy-eight million, five hundred fifty-five thousand, sixty-one".