61335928365991 has 4 divisors (see below), whose sum is σ = 61376846265000. Its totient is φ = 61295010466984.

The previous prime is 61335928365953. The next prime is 61335928366003. The reversal of 61335928365991 is 19956382953316.

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

It is a cyclic number.

It is not a de Polignac number, because 61335928365991 - 2³³ = 61327338431399 is a prime.

It is a super-2 number, since 2×61335928365991² (a number of 28 digits) contains 22 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 61335928365991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61335928365941) 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, 20458947256 + ... + 20458950253.

It is an arithmetic number, because the mean of its divisors is an integer number (15344211566250).

Almost surely, 2^{61335928365991} is an apocalyptic number.

61335928365991 is a deficient number, since it is larger than the sum of its proper divisors (40917899009).

61335928365991 is a wasteful number, since it uses less digits than its factorization.

61335928365991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40917899008.

The product of its digits is 283435200, while the sum is 70.

The spelling of 61335928365991 in words is "sixty-one trillion, three hundred thirty-five billion, nine hundred twenty-eight million, three hundred sixty-five thousand, nine hundred ninety-one".