1216454745 has 24 divisors (see below), whose sum is σ = 2139355008. Its totient is φ = 589795360.

The previous prime is 1216454671. The next prime is 1216454761. The reversal of 1216454745 is 5474546121.

It is not a de Polignac number, because 1216454745 - 2¹² = 1216450649 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 333297 + ... + 336926.

It is an arithmetic number, because the mean of its divisors is an integer number (89139792).

Almost surely, 2^1216454745 is an apocalyptic number.

1216454745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1216454745 is a deficient number, since it is larger than the sum of its proper divisors (922900263).

1216454745 is a wasteful number, since it uses less digits than its factorization.

1216454745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670253 (or 670242 counting only the distinct ones).

The product of its digits is 134400, while the sum is 39.

The square root of 1216454745 is about 34877.7112924573. The cubic root of 1216454745 is about 1067.4936957910.

The spelling of 1216454745 in words is "one billion, two hundred sixteen million, four hundred fifty-four thousand, seven hundred forty-five".