61751605642 has 4 divisors (see below), whose sum is σ = 92627408466. Its totient is φ = 30875802820.

The previous prime is 61751605609. The next prime is 61751605651. The reversal of 61751605642 is 24650615716.

61751605642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 34786353121 + 26965252521 = 186511^2 + 164211^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15437901409 + ... + 15437901412.

Almost surely, 2^61751605642 is an apocalyptic number.

61751605642 is a deficient number, since it is larger than the sum of its proper divisors (30875802824).

61751605642 is a wasteful number, since it uses less digits than its factorization.

61751605642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30875802823.

The product of its (nonzero) digits is 302400, while the sum is 43.

The spelling of 61751605642 in words is "sixty-one billion, seven hundred fifty-one million, six hundred five thousand, six hundred forty-two".