1215615655 has 8 divisors (see below), whose sum is σ = 1461169584. Its totient is φ = 970872000.

The previous prime is 1215615647. The next prime is 1215615673. The reversal of 1215615655 is 5565165121.

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

It is not a de Polignac number, because 1215615655 - 2³ = 1215615647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199261 + ... + 205270.

It is an arithmetic number, because the mean of its divisors is an integer number (182646198).

Almost surely, 2^1215615655 is an apocalyptic number.

1215615655 is a deficient number, since it is larger than the sum of its proper divisors (245553929).

1215615655 is an equidigital number, since it uses as much as digits as its factorization.

1215615655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405137.

The product of its digits is 45000, while the sum is 37.

The square root of 1215615655 is about 34865.6801884030. The cubic root of 1215615655 is about 1067.2481929423.

The spelling of 1215615655 in words is "one billion, two hundred fifteen million, six hundred fifteen thousand, six hundred fifty-five".