7780205061 has 8 divisors (see below), whose sum is σ = 11526229760. Its totient is φ = 5186803356.

The previous prime is 7780205051. The next prime is 7780205071. The reversal of 7780205061 is 1605020877.

7780205061 is a `hidden beast` number, since 77 + 80 + 2 + 0 + 506 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (7780205051) and next prime (7780205071).

It is not a de Polignac number, because 7780205061 - 2⁵ = 7780205029 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 (7780205051) 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, 144077845 + ... + 144077898.

It is an arithmetic number, because the mean of its divisors is an integer number (1440778720).

Almost surely, 2^7780205061 is an apocalyptic number.

It is an amenable number.

7780205061 is a deficient number, since it is larger than the sum of its proper divisors (3746024699).

7780205061 is a wasteful number, since it uses less digits than its factorization.

7780205061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288155752 (or 288155746 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 7780205061 is about 88205.4706976841. The cubic root of 7780205061 is about 1981.5134044654.

The spelling of 7780205061 in words is "seven billion, seven hundred eighty million, two hundred five thousand, sixty-one".