61660437893 has 16 divisors (see below), whose sum is σ = 62977388544. Its totient is φ = 60361902720.

The previous prime is 61660437887. The next prime is 61660437899. The reversal of 61660437893 is 39873406616.

It is an interprime number because it is at equal distance from previous prime (61660437887) and next prime (61660437899).

It is a cyclic number.

It is not a de Polignac number, because 61660437893 - 2¹⁶ = 61660372357 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 (61660437899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2895023 + ... + 2916243.

It is an arithmetic number, because the mean of its divisors is an integer number (3936086784).

Almost surely, 2^61660437893 is an apocalyptic number.

It is an amenable number.

61660437893 is a deficient number, since it is larger than the sum of its proper divisors (1316950651).

61660437893 is a wasteful number, since it uses less digits than its factorization.

61660437893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21652.

The product of its (nonzero) digits is 3919104, while the sum is 53.

The spelling of 61660437893 in words is "sixty-one billion, six hundred sixty million, four hundred thirty-seven thousand, eight hundred ninety-three".