61256633747 has 4 divisors (see below), whose sum is σ = 61632441480. Its totient is φ = 60880826016.

The previous prime is 61256633741. The next prime is 61256633761. The reversal of 61256633747 is 74733665216.

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

It is a cyclic number.

It is not a de Polignac number, because 61256633747 - 2¹⁴ = 61256617363 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61256633695 and 61256633704.

It is not an unprimeable number, because it can be changed into a prime (61256633741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187903622 + ... + 187903947.

It is an arithmetic number, because the mean of its divisors is an integer number (15408110370).

Almost surely, 2^61256633747 is an apocalyptic number.

61256633747 is a deficient number, since it is larger than the sum of its proper divisors (375807733).

61256633747 is a wasteful number, since it uses less digits than its factorization.

61256633747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375807732.

The product of its digits is 3810240, while the sum is 50.

The spelling of 61256633747 in words is "sixty-one billion, two hundred fifty-six million, six hundred thirty-three thousand, seven hundred forty-seven".