61138021456 has 10 divisors (see below), whose sum is σ = 118454916602. Its totient is φ = 30569010720.

The previous prime is 61138021433. The next prime is 61138021499. The reversal of 61138021456 is 65412083116.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 60900368400 + 237653056 = 246780^2 + 15416^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1910563155 + ... + 1910563186.

Almost surely, 2^61138021456 is an apocalyptic number.

It is an amenable number.

61138021456 is a deficient number, since it is larger than the sum of its proper divisors (57316895146).

61138021456 is a wasteful number, since it uses less digits than its factorization.

61138021456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3821126349 (or 3821126343 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

The spelling of 61138021456 in words is "sixty-one billion, one hundred thirty-eight million, twenty-one thousand, four hundred fifty-six".