781172359061 has 8 divisors (see below), whose sum is σ = 784904785920. Its totient is φ = 777442725648.

The previous prime is 781172358991. The next prime is 781172359069. The reversal of 781172359061 is 160953271187.

It is a happy number.

781172359061 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 781172359061 - 2²² = 781168164757 is a prime.

It is a super-2 number, since 2×781172359061² (a number of 25 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 (781172359069) 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, 136661 + ... + 1257386.

It is an arithmetic number, because the mean of its divisors is an integer number (98113098240).

Almost surely, 2^781172359061 is an apocalyptic number.

It is an amenable number.

781172359061 is a deficient number, since it is larger than the sum of its proper divisors (3732426859).

781172359061 is a wasteful number, since it uses less digits than its factorization.

781172359061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1396723.

The product of its (nonzero) digits is 635040, while the sum is 50.

The spelling of 781172359061 in words is "seven hundred eighty-one billion, one hundred seventy-two million, three hundred fifty-nine thousand, sixty-one".