61871587601 has 4 divisors (see below), whose sum is σ = 65511092772. Its totient is φ = 58232082432.

The previous prime is 61871587573. The next prime is 61871587639. The reversal of 61871587601 is 10678517816.

It is a happy number.

It is a Cunningham number, because it is equal to 248740²+1.

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 48169714576 + 13701873025 = 219476^2 + 117055^2 .

It is a cyclic number.

It is not a de Polignac number, because 61871587601 - 2¹⁰ = 61871586577 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61871587601.

It is not an unprimeable number, because it can be changed into a prime (61871587651) 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, 1819752560 + ... + 1819752593.

It is an arithmetic number, because the mean of its divisors is an integer number (16377773193).

Almost surely, 2^61871587601 is an apocalyptic number.

It is an amenable number.

61871587601 is a deficient number, since it is larger than the sum of its proper divisors (3639505171).

61871587601 is a wasteful number, since it uses less digits than its factorization.

61871587601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3639505170.

The product of its (nonzero) digits is 564480, while the sum is 50.

The spelling of 61871587601 in words is "sixty-one billion, eight hundred seventy-one million, five hundred eighty-seven thousand, six hundred one".