61245881766 has 24 divisors (see below), whose sum is σ = 133578220464. Its totient is φ = 20280092400.

The previous prime is 61245881717. The next prime is 61245881779. The reversal of 61245881766 is 66718854216.

61245881766 is a `hidden beast` number, since 6 + 12 + 458 + 8 + 176 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11264001 + ... + 11269436.

It is an arithmetic number, because the mean of its divisors is an integer number (5565759186).

Almost surely, 2^61245881766 is an apocalyptic number.

61245881766 is an abundant number, since it is smaller than the sum of its proper divisors (72332338698).

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

61245881766 is a wasteful number, since it uses less digits than its factorization.

61245881766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22533596 (or 22533593 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 54.

The spelling of 61245881766 in words is "sixty-one billion, two hundred forty-five million, eight hundred eighty-one thousand, seven hundred sixty-six".