140878765871561 has 4 divisors (see below), whose sum is σ = 140887639022532. Its totient is φ = 140869892720592.

The previous prime is 140878765871551. The next prime is 140878765871737. The reversal of 140878765871561 is 165178567878041.

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

It can be written as a sum of positive squares in 2 ways, for example, as 134093366057161 + 6785399814400 = 11579869^2 + 2604880^2 .

It is a cyclic number.

It is not a de Polignac number, because 140878765871561 - 2²² = 140878761677257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140878765871551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4436551670 + ... + 4436583423.

It is an arithmetic number, because the mean of its divisors is an integer number (35221909755633).

Almost surely, 2^{140878765871561} is an apocalyptic number.

It is an amenable number.

140878765871561 is a deficient number, since it is larger than the sum of its proper divisors (8873150971).

140878765871561 is an equidigital number, since it uses as much as digits as its factorization.

140878765871561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8873150970.

The product of its (nonzero) digits is 632217600, while the sum is 74.

The spelling of 140878765871561 in words is "one hundred forty trillion, eight hundred seventy-eight billion, seven hundred sixty-five million, eight hundred seventy-one thousand, five hundred sixty-one".