61218257315 has 8 divisors (see below), whose sum is σ = 75447366000. Its totient is φ = 47650967712.

The previous prime is 61218257291. The next prime is 61218257323. The reversal of 61218257315 is 51375281216.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 61218257315 - 2¹⁸ = 61217995171 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165454565 + ... + 165454934.

It is an arithmetic number, because the mean of its divisors is an integer number (9430920750).

Almost surely, 2^61218257315 is an apocalyptic number.

61218257315 is a deficient number, since it is larger than the sum of its proper divisors (14229108685).

61218257315 is a wasteful number, since it uses less digits than its factorization.

61218257315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330909541.

The product of its digits is 100800, while the sum is 41.

The spelling of 61218257315 in words is "sixty-one billion, two hundred eighteen million, two hundred fifty-seven thousand, three hundred fifteen".