61091381837 has 8 divisors (see below), whose sum is σ = 61705543680. Its totient is φ = 60478196400.

The previous prime is 61091381833. The next prime is 61091381839. The reversal of 61091381837 is 73818319016.

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 61091381837 - 2² = 61091381833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61091381791 and 61091381800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61091381833) 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, 118013 + ... + 368930.

It is an arithmetic number, because the mean of its divisors is an integer number (7713192960).

Almost surely, 2^61091381837 is an apocalyptic number.

It is an amenable number.

61091381837 is a deficient number, since it is larger than the sum of its proper divisors (614161843).

61091381837 is a wasteful number, since it uses less digits than its factorization.

61091381837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488203.

The product of its (nonzero) digits is 217728, while the sum is 47.

The spelling of 61091381837 in words is "sixty-one billion, ninety-one million, three hundred eighty-one thousand, eight hundred thirty-seven".