61827268815 has 48 divisors (see below), whose sum is σ = 119685410208. Its totient is φ = 30438032256.

The previous prime is 61827268793. The next prime is 61827268817. The reversal of 61827268815 is 51886272816.

61827268815 is a `hidden beast` number, since 618 + 2 + 7 + 2 + 6 + 8 + 8 + 15 = 666.

It is not a de Polignac number, because 61827268815 - 2¹³ = 61827260623 is a prime.

It is a super-2 number, since 2×61827268815² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61827268817) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 1941384 + ... + 1972973.

It is an arithmetic number, because the mean of its divisors is an integer number (2493446046).

Almost surely, 2^61827268815 is an apocalyptic number.

61827268815 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

61827268815 is a deficient number, since it is larger than the sum of its proper divisors (57858141393).

61827268815 is a wasteful number, since it uses less digits than its factorization.

61827268815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3914390 (or 3914378 counting only the distinct ones).

The product of its digits is 2580480, while the sum is 54.

The spelling of 61827268815 in words is "sixty-one billion, eight hundred twenty-seven million, two hundred sixty-eight thousand, eight hundred fifteen".