61535386381 has 8 divisors (see below), whose sum is σ = 70449756480. Its totient is φ = 52651916448.

The previous prime is 61535386379. The next prime is 61535386411. The reversal of 61535386381 is 18368353516.

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 61535386381 - 2¹ = 61535386379 is a prime.

It is a super-2 number, since 2×61535386381² (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 (61535386331) 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, 7720771 + ... + 7728736.

It is an arithmetic number, because the mean of its divisors is an integer number (8806219560).

Almost surely, 2^61535386381 is an apocalyptic number.

It is an amenable number.

61535386381 is a deficient number, since it is larger than the sum of its proper divisors (8914370099).

61535386381 is a wasteful number, since it uses less digits than its factorization.

61535386381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15450083.

The product of its digits is 1555200, while the sum is 49.

The spelling of 61535386381 in words is "sixty-one billion, five hundred thirty-five million, three hundred eighty-six thousand, three hundred eighty-one".