61578187101 has 12 divisors (see below), whose sum is σ = 88985090428. Its totient is φ = 41034207744.

The previous prime is 61578187079. The next prime is 61578187103. The reversal of 61578187101 is 10178187516.

It is a happy number.

61578187101 is a `hidden beast` number, since 6 + 1 + 578 + 1 + 8 + 71 + 0 + 1 = 666.

61578187101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 23909199876 + 37668987225 = 154626^2 + 194085^2 .

It is not a de Polignac number, because 61578187101 - 2⁶ = 61578187037 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 (61578187103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1471300 + ... + 1512573.

Almost surely, 2^61578187101 is an apocalyptic number.

It is an amenable number.

61578187101 is a deficient number, since it is larger than the sum of its proper divisors (27406903327).

61578187101 is a wasteful number, since it uses less digits than its factorization.

61578187101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2986172 (or 2986169 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 45.

The spelling of 61578187101 in words is "sixty-one billion, five hundred seventy-eight million, one hundred eighty-seven thousand, one hundred one".