61881610707 has 24 divisors (see below), whose sum is σ = 102162873696. Its totient is φ = 35357769216.

The previous prime is 61881610673. The next prime is 61881610709. The reversal of 61881610707 is 70701618816.

It is a happy number.

61881610707 is a `hidden beast` number, since 618 + 8 + 16 + 10 + 7 + 0 + 7 = 666.

It is not a de Polignac number, because 61881610707 - 2⁷ = 61881610579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61881610709) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 795513 + ... + 869829.

It is an arithmetic number, because the mean of its divisors is an integer number (4256786404).

Almost surely, 2^61881610707 is an apocalyptic number.

61881610707 is a deficient number, since it is larger than the sum of its proper divisors (40281262989).

61881610707 is a wasteful number, since it uses less digits than its factorization.

61881610707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87547 (or 87544 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 45.

The spelling of 61881610707 in words is "sixty-one billion, eight hundred eighty-one million, six hundred ten thousand, seven hundred seven".