611780061 has 16 divisors (see below), whose sum is σ = 821918720. Its totient is φ = 404760240.

The previous prime is 611780051. The next prime is 611780063. The reversal of 611780061 is 160087116.

It is a happy number.

It is not a de Polignac number, because 611780061 - 2⁶ = 611779997 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 (611780063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 228750 + ... + 231408.

It is an arithmetic number, because the mean of its divisors is an integer number (51369920).

Almost surely, 2^611780061 is an apocalyptic number.

It is an amenable number.

611780061 is a deficient number, since it is larger than the sum of its proper divisors (210138659).

611780061 is a wasteful number, since it uses less digits than its factorization.

611780061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3216.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 611780061 is about 24734.1881006836. The cubic root of 611780061 is about 848.9167566597.

The spelling of 611780061 in words is "six hundred eleven million, seven hundred eighty thousand, sixty-one".