61400818759 has 4 divisors (see below), whose sum is σ = 70172364304. Its totient is φ = 52629273216.

The previous prime is 61400818747. The next prime is 61400818771. The reversal of 61400818759 is 95781800416.

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

It is an interprime number because it is at equal distance from previous prime (61400818747) and next prime (61400818771).

It is a cyclic number.

It is not a de Polignac number, because 61400818759 - 2¹⁷ = 61400687687 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61400818459) 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, 4385772762 + ... + 4385772775.

It is an arithmetic number, because the mean of its divisors is an integer number (17543091076).

Almost surely, 2^61400818759 is an apocalyptic number.

61400818759 is a deficient number, since it is larger than the sum of its proper divisors (8771545545).

61400818759 is an equidigital number, since it uses as much as digits as its factorization.

61400818759 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8771545544.

The product of its (nonzero) digits is 483840, while the sum is 49.

The spelling of 61400818759 in words is "sixty-one billion, four hundred million, eight hundred eighteen thousand, seven hundred fifty-nine".