61242015856 has 20 divisors (see below), whose sum is σ = 135607321072. Its totient is φ = 26246578176.

The previous prime is 61242015847. The next prime is 61242015859. The reversal of 61242015856 is 65851024216.

It is a super-2 number, since 2×61242015856² (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 (61242015859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 273401745 + ... + 273401968.

Almost surely, 2^61242015856 is an apocalyptic number.

It is an amenable number.

61242015856 is an abundant number, since it is smaller than the sum of its proper divisors (74365305216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61242015856 is a wasteful number, since it uses less digits than its factorization.

61242015856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546803728 (or 546803722 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 40.

The spelling of 61242015856 in words is "sixty-one billion, two hundred forty-two million, fifteen thousand, eight hundred fifty-six".