61039991887 has 8 divisors (see below), whose sum is σ = 70600473216. Its totient is φ = 51689631192.

The previous prime is 61039991861. The next prime is 61039991897. The reversal of 61039991887 is 78819993016.

61039991887 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61039991887 - 2²³ = 61031603279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61039991897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52529533 + ... + 52530694.

It is an arithmetic number, because the mean of its divisors is an integer number (8825059152).

Almost surely, 2^61039991887 is an apocalyptic number.

61039991887 is a deficient number, since it is larger than the sum of its proper divisors (9560481329).

61039991887 is a wasteful number, since it uses less digits than its factorization.

61039991887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105060317.

The product of its (nonzero) digits is 5878656, while the sum is 61.

The spelling of 61039991887 in words is "sixty-one billion, thirty-nine million, nine hundred ninety-one thousand, eight hundred eighty-seven".