1366045821 has 48 divisors (see below), whose sum is σ = 2304806400. Its totient is φ = 763514784.

The previous prime is 1366045771. The next prime is 1366045823. The reversal of 1366045821 is 1285406631.

It is a happy number.

1366045821 is a `hidden beast` number, since 13 + 6 + 60 + 4 + 582 + 1 = 666.

It is not a de Polignac number, because 1366045821 - 2¹¹ = 1366043773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1366045823) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 842950 + ... + 844568.

It is an arithmetic number, because the mean of its divisors is an integer number (48016800).

Almost surely, 2^1366045821 is an apocalyptic number.

It is an amenable number.

1366045821 is a deficient number, since it is larger than the sum of its proper divisors (938760579).

1366045821 is a wasteful number, since it uses less digits than its factorization.

1366045821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1918 (or 1915 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 1366045821 is about 36960.0571022286. The cubic root of 1366045821 is about 1109.5709785897.

The spelling of 1366045821 in words is "one billion, three hundred sixty-six million, forty-five thousand, eight hundred twenty-one".