22378065649 has 9 divisors (see below), whose sum is σ = 22511241337. Its totient is φ = 22245675844.

The previous prime is 22378065641. The next prime is 22378065653. The reversal of 22378065649 is 94656087322.

The square root of 22378065649 is 149593.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 22378065649 - 2³ = 22378065641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22378065596 and 22378065605.

It is not an unprimeable number, because it can be changed into a prime (22378065641) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 33957282 + ... + 33957940.

Almost surely, 2^22378065649 is an apocalyptic number.

22378065649 is the 149593-rd square number.

22378065649 is the 74797-th centered octagonal number.

It is an amenable number.

22378065649 is a deficient number, since it is larger than the sum of its proper divisors (133175688).

22378065649 is an frugal number, since it uses more digits than its factorization.

22378065649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1772 (or 886 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 52.

The spelling of 22378065649 in words is "twenty-two billion, three hundred seventy-eight million, sixty-five thousand, six hundred forty-nine".