61861045487 has 4 divisors (see below), whose sum is σ = 61862184336. Its totient is φ = 61859906640.

The previous prime is 61861045457. The next prime is 61861045517. The reversal of 61861045487 is 78454016816.

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 (61861045457) and next prime (61861045517).

It is a cyclic number.

It is not a de Polignac number, because 61861045487 - 2²⁸ = 61592610031 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 (61861045457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 483638 + ... + 598019.

It is an arithmetic number, because the mean of its divisors is an integer number (15465546084).

Almost surely, 2^61861045487 is an apocalyptic number.

61861045487 is a deficient number, since it is larger than the sum of its proper divisors (1138849).

61861045487 is a wasteful number, since it uses less digits than its factorization.

61861045487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1138848.

The product of its (nonzero) digits is 1290240, while the sum is 50.

The spelling of 61861045487 in words is "sixty-one billion, eight hundred sixty-one million, forty-five thousand, four hundred eighty-seven".