1216647675 has 48 divisors (see below), whose sum is σ = 2332231680. Its totient is φ = 620658720.

The previous prime is 1216647671. The next prime is 1216647683. The reversal of 1216647675 is 5767466121.

1216647675 is a `hidden beast` number, since 12 + 166 + 476 + 7 + 5 = 666.

It is not a de Polignac number, because 1216647675 - 2² = 1216647671 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1216647675.

It is not an unprimeable number, because it can be changed into a prime (1216647671) 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, 23659 + ... + 54708.

It is an arithmetic number, because the mean of its divisors is an integer number (48588160).

Almost surely, 2^1216647675 is an apocalyptic number.

1216647675 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1216647675 is a deficient number, since it is larger than the sum of its proper divisors (1115584005).

1216647675 is a wasteful number, since it uses less digits than its factorization.

1216647675 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78409 (or 78398 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The square root of 1216647675 is about 34880.4769892844. The cubic root of 1216647675 is about 1067.5501277223.

The spelling of 1216647675 in words is "one billion, two hundred sixteen million, six hundred forty-seven thousand, six hundred seventy-five".