61138816772 has 24 divisors (see below), whose sum is σ = 116804685312. Its totient is φ = 27770103200.

The previous prime is 61138816771. The next prime is 61138816799. The reversal of 61138816772 is 27761883116.

It is a self number, because there is not a number n which added to its sum of digits gives 61138816772.

It is not an unprimeable number, because it can be changed into a prime (61138816771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 445604 + ... + 566427.

It is an arithmetic number, because the mean of its divisors is an integer number (4866861888).

Almost surely, 2^61138816772 is an apocalyptic number.

It is an amenable number.

61138816772 is a deficient number, since it is larger than the sum of its proper divisors (55665868540).

61138816772 is a wasteful number, since it uses less digits than its factorization.

61138816772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1013419 (or 1013417 counting only the distinct ones).

The product of its digits is 677376, while the sum is 50.

The spelling of 61138816772 in words is "sixty-one billion, one hundred thirty-eight million, eight hundred sixteen thousand, seven hundred seventy-two".