1216150065 has 32 divisors (see below), whose sum is σ = 2328359040. Its totient is φ = 598719168.

The previous prime is 1216150007. The next prime is 1216150079. The reversal of 1216150065 is 5600516121.

It is a happy number.

It is not a de Polignac number, because 1216150065 - 2¹² = 1216145969 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 344727 + ... + 348236.

It is an arithmetic number, because the mean of its divisors is an integer number (72761220).

Almost surely, 2^1216150065 is an apocalyptic number.

1216150065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1216150065 is a deficient number, since it is larger than the sum of its proper divisors (1112208975).

1216150065 is a wasteful number, since it uses less digits than its factorization.

1216150065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692990 (or 692984 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 1216150065 is about 34873.3431864512. The cubic root of 1216150065 is about 1067.4045648859.

Adding to 1216150065 its reverse (5600516121), we get a palindrome (6816666186).

It can be divided in two parts, 12161 and 50065, that added together give a palindrome (62226).

The spelling of 1216150065 in words is "one billion, two hundred sixteen million, one hundred fifty thousand, sixty-five".