21880815166 has 32 divisors (see below), whose sum is σ = 38187624960. Its totient is φ = 9208428000.

The previous prime is 21880815109. The next prime is 21880815167. The reversal of 21880815166 is 66151808812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21880815167) 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, 763191 + ... + 791341.

It is an arithmetic number, because the mean of its divisors is an integer number (1193363280).

Almost surely, 2^21880815166 is an apocalyptic number.

21880815166 is a deficient number, since it is larger than the sum of its proper divisors (16306809794).

21880815166 is a wasteful number, since it uses less digits than its factorization.

21880815166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29160.

The product of its (nonzero) digits is 184320, while the sum is 46.

The spelling of 21880815166 in words is "twenty-one billion, eight hundred eighty million, eight hundred fifteen thousand, one hundred sixty-six".