21772066505 has 8 divisors (see below), whose sum is σ = 29858834112. Its totient is φ = 14929417008.

The previous prime is 21772066493. The next prime is 21772066513. The reversal of 21772066505 is 50566027712.

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

It is a cyclic number.

It is not a de Polignac number, because 21772066505 - 2⁴ = 21772066489 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 311029487 + ... + 311029556.

It is an arithmetic number, because the mean of its divisors is an integer number (3732354264).

Almost surely, 2^21772066505 is an apocalyptic number.

It is an amenable number.

21772066505 is a deficient number, since it is larger than the sum of its proper divisors (8086767607).

21772066505 is an equidigital number, since it uses as much as digits as its factorization.

21772066505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622059055.

The product of its (nonzero) digits is 176400, while the sum is 41.

The spelling of 21772066505 in words is "twenty-one billion, seven hundred seventy-two million, sixty-six thousand, five hundred five".