61836616393 has 4 divisors (see below), whose sum is σ = 63968913540. Its totient is φ = 59704319248.

The previous prime is 61836616367. The next prime is 61836616399. The reversal of 61836616393 is 39361663816.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 51923825424 + 9912790969 = 227868^2 + 99563^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61836616393 is a prime.

It is a super-3 number, since 3×61836616393³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61836616393.

It is not an unprimeable number, because it can be changed into a prime (61836616399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1066148530 + ... + 1066148587.

It is an arithmetic number, because the mean of its divisors is an integer number (15992228385).

Almost surely, 2^61836616393 is an apocalyptic number.

It is an amenable number.

61836616393 is a deficient number, since it is larger than the sum of its proper divisors (2132297147).

61836616393 is a wasteful number, since it uses less digits than its factorization.

61836616393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2132297146.

The product of its digits is 2519424, while the sum is 52.

The spelling of 61836616393 in words is "sixty-one billion, eight hundred thirty-six million, six hundred sixteen thousand, three hundred ninety-three".