61138995869 has 8 divisors (see below), whose sum is σ = 70055577600. Its totient is φ = 52268024016.

The previous prime is 61138995839. The next prime is 61138995913. The reversal of 61138995869 is 96859983116.

61138995869 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 61138995869 - 2⁸ = 61138995613 is a prime.

It is a super-2 number, since 2×61138995869² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61138995809) 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, 11399594 + ... + 11404955.

It is an arithmetic number, because the mean of its divisors is an integer number (8756947200).

Almost surely, 2^61138995869 is an apocalyptic number.

It is an amenable number.

61138995869 is a deficient number, since it is larger than the sum of its proper divisors (8916581731).

61138995869 is a wasteful number, since it uses less digits than its factorization.

61138995869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22804939.

The product of its digits is 25194240, while the sum is 65.

The spelling of 61138995869 in words is "sixty-one billion, one hundred thirty-eight million, nine hundred ninety-five thousand, eight hundred sixty-nine".