61540006607639 has 4 divisors (see below), whose sum is σ = 70331436123024. Its totient is φ = 52748577092256.

The previous prime is 61540006607603. The next prime is 61540006607647. The reversal of 61540006607639 is 93670660004516.

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 61540006607639 - 2⁸ = 61540006607383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61540006607659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4395714757682 + ... + 4395714757695.

It is an arithmetic number, because the mean of its divisors is an integer number (17582859030756).

Almost surely, 2^{61540006607639} is an apocalyptic number.

61540006607639 is a deficient number, since it is larger than the sum of its proper divisors (8791429515385).

61540006607639 is an equidigital number, since it uses as much as digits as its factorization.

61540006607639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8791429515384.

The product of its (nonzero) digits is 4898880, while the sum is 53.

The spelling of 61540006607639 in words is "sixty-one trillion, five hundred forty billion, six million, six hundred seven thousand, six hundred thirty-nine".