61897063617 has 12 divisors (see below), whose sum is σ = 93294125184. Its totient is φ = 39470591160.

The previous prime is 61897063561. The next prime is 61897063637. The reversal of 61897063617 is 71636079816.

It is a happy number.

61897063617 is a `hidden beast` number, since 6 + 18 + 9 + 7 + 0 + 6 + 3 + 617 = 666.

61897063617 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61897063617 - 2¹⁵ = 61897030849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61897063637) 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, 149509609 + ... + 149510022.

It is an arithmetic number, because the mean of its divisors is an integer number (7774510432).

Almost surely, 2^61897063617 is an apocalyptic number.

It is an amenable number.

61897063617 is a deficient number, since it is larger than the sum of its proper divisors (31397061567).

61897063617 is a wasteful number, since it uses less digits than its factorization.

61897063617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299019660 (or 299019657 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 54.

The spelling of 61897063617 in words is "sixty-one billion, eight hundred ninety-seven million, sixty-three thousand, six hundred seventeen".