61408804866 has 16 divisors (see below), whose sum is σ = 122841719904. Its totient is φ = 20465583264.

The previous prime is 61408804823. The next prime is 61408804939. The reversal of 61408804866 is 66840880416.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 971395 + ... + 1032678.

It is an arithmetic number, because the mean of its divisors is an integer number (7677607494).

Almost surely, 2^61408804866 is an apocalyptic number.

61408804866 is an abundant number, since it is smaller than the sum of its proper divisors (61432915038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61408804866 is a wasteful number, since it uses less digits than its factorization.

61408804866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2009185.

The product of its (nonzero) digits is 1769472, while the sum is 51.

The spelling of 61408804866 in words is "sixty-one billion, four hundred eight million, eight hundred four thousand, eight hundred sixty-six".