1215066651 has 8 divisors (see below), whose sum is σ = 1624759104. Its totient is φ = 807709320.

The previous prime is 1215066623. The next prime is 1215066661. The reversal of 1215066651 is 1566605121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1215066651 - 2¹¹ = 1215064603 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1215066661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 582565 + ... + 584646.

It is an arithmetic number, because the mean of its divisors is an integer number (203094888).

Almost surely, 2^1215066651 is an apocalyptic number.

1215066651 is a deficient number, since it is larger than the sum of its proper divisors (409692453).

1215066651 is a wasteful number, since it uses less digits than its factorization.

1215066651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1167561.

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 1215066651 is about 34857.8061702110. The cubic root of 1215066651 is about 1067.0875029652.

The spelling of 1215066651 in words is "one billion, two hundred fifteen million, sixty-six thousand, six hundred fifty-one".