61897660789 has 8 divisors (see below), whose sum is σ = 65215942272. Its totient is φ = 58631635920.

The previous prime is 61897660771. The next prime is 61897660801. The reversal of 61897660789 is 98706679816.

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 61897660789 - 2⁵ = 61897660757 is a prime.

It is a super-2 number, since 2×61897660789² (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 (61897660709) 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, 13061722 + ... + 13066459.

It is an arithmetic number, because the mean of its divisors is an integer number (8151992784).

Almost surely, 2^61897660789 is an apocalyptic number.

It is an amenable number.

61897660789 is a deficient number, since it is larger than the sum of its proper divisors (3318281483).

61897660789 is a wasteful number, since it uses less digits than its factorization.

61897660789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26128307.

The product of its (nonzero) digits is 54867456, while the sum is 67.

The spelling of 61897660789 in words is "sixty-one billion, eight hundred ninety-seven million, six hundred sixty thousand, seven hundred eighty-nine".